Schematics Diagram For The Wiring In A Ford Ranger 1991

The Electronic Engine Control (EEC) comprises the brain AND the sensors. Trouble codes are listed below. Check your emission label for more information on your vehicle. The EEC-IV system was started in 1984, with the check engine light being added in 1988. A good overview of this system can be found HERE.During basic operation, the EEC-IV determines the ignition timing required by the engine and a DIS module determines which ignition coil to fire.

Before running the KOER test or attempting to get new codes after servicing your vehicle, perform these procedures first.

Check all engine vacuum hoses for:
- Leaks (cracks) or pinched hoses.
- Proper emission routing per Vehicle Emission Control Information (VECI) Decal.

Check the EEC system wiring harness electrical connections for:
- Proper connections.
- Loose or detached connectors, wires and terminals.
- Corrosion. SPECIAL NOTE: Check all vehicle grounds in engine compartment, due to the age of the truck, many loose their connection creating many problems.
- Water in connectors or cans.

It may be necessary to disconnect or disassemble the connector assembly to perform some of the inspections. (Note the location of each pin before disassembly.)
-Check processor, sensors and actuators for physical damage.
-Perform all safety steps required to start and run operational vehicle tests.
-Apply the emergency brake. Place shift lever in Park; Neutral for manual transmission.
-Turn off

such as the radio, lamps, air conditioner, etc. Be sure doors are closed whenever readings are made.
-Verify engine coolant is at the specified level.
-Verify that battery is at 12 volts or more.
-NOTE - If for some reason you have disconnected the speedo from the transmission, reconnect it.

Start engine and idle until the upper radiator hose is hot and pressurized and the throttle is off fast idle. While the engine is operating, check for leaks around the exhaust manifold, EGO sensor, and vacuum hose connections.

O—Key On, engine Off (KOEO), codes with the engine running. The engine MUST be at the operating temperature before retrieval of these codes.

C—Continuous memory code, codes that were stored while the engine PREVIOUSLY ran. These produce the "Check engine light" illumination. They may or may not currently exist.
R—Engine running (ER), also known as key on engine running (KOER), codes produced while the engine is running NOW.

Code

Type

System Pass C/O/R

RPM Not Within Self Test Upper Limit R

RPM Not Within Self Test Lower Limit - - CheckIdle Speed Control motor or Air Bypass R DC Motor Did Not Move C/O/R

Profile Ignition Pickup (PIP) Circuit Failure C Engine RPM Sensor Circuit Fault (Diesel) --Clean tach sensor before doing replacement C

EEC Processor Read only Memory (ROM) Test Failed O EEC Processor Keep Alive Memory (KAM) Test Failed C

Ignition Diagnostic Module (2.9L, 3.0L & 4.0L) O Idle RPM High With ISC Retracted (2.5L) R RPM Above Self Test Limit With ISC Off (1986–90 1.9L EFI) R RPM Too Low To Perform HO2S Test (Others) R

Idle RPM Low With ISC Retracted (1.9L & 2.5L CFI) R RPM Below Self Test Limit With ISC Off (1986–90 1.9L EFI) R

Spark Out (SPOUT) Circuit Open R Loss Of Ignition Diagnostic Module Input To PCM/SPOUT Circuit Grounded C Spark Angle Word (SAW) Circuit Failure (1.9L SFI) C/R

Failure In PCM Internal Voltage R Erratic RPM During Hard Idle Self Test R RPM Drop Too Low During ISC Off Test (1.9L EFI) R Power Processor Check (2.3L HSC EFI) O Cylinder Identification Sensor Input Failure (3.0L SHO) C

Engine Coolant Temperature (ECT) Sensor Out Of Self Test Range O/R

Manifold Absolute Pressure/Barometric Pressure Sensor Out Of Self Test Range --There are 3 wires to the MAP, one is 5v reference voltage (VREF), the other is ground, and the middle wire is supposed to read 2.5v. However, if the sensor is disconnected or a wire is broken, you will get the code. The MAP sensor could be bad internally as well. C/O/R

Throttle Position Sensor Out Of Self Test Range C/O/R Fuel Injector Pump Lever Sensor Input Is Out Of Self Test Range (Diesel) O/R

Intake Air Temperature/Air Charge Temperature Sensor Out Of Self Test Range O/R

Knock Not Sensed During Dynamic Response Test R

Mass Air Flow/Vane Air Flow Sensor Out Of Self Test Range O/R Transmission Fluid Temperature Sensor Input Out Of Self Test Range (5.0L, 5.8L, 7.3L & 7.5L Truck) O/R

Vehicle Speed Sensor (2.3L Turbo) C

Loss Of Ignition Diagnostic Module RH Side C Vane Air Temperature Sensor Input Out Of Self Test Range (1.9L EFI) O/R

Insufficient Input From Programmable Speedometer/Odometer Module (From 1993) C Insufficient Input From Vehicle Speed Sensor (To 1992) C

EGR Valve Position/Pressure Feedback EGR Circuit Below Minimum Voltage C/O/R

EGR Not Controlling (2.3L OHC & 3.8L CFI) R EGR Valve Not Seated (1.9L CFI, 2.9L & 3.0L SHO) C/R EGR Valve Position/Pressure Feedback EGR Voltage Below Closed Voltage (Others) C/O/R

EGR Not Closing Properly (2.3L OHC & 3.8L CFI) C/R Throttle Position Sensor Noisy/Harsh On Line (Diesel) C EGR Valve Opening Not Detected (Others) C/R

EGR Valve Opening Not Detected (2.3L OHC & 3.8L CFI) R Defective EGR Pressure Transducer Sensor (1.9L CFI, 2.3L HSC EFI & 3.0L) C/O/R EGR On/Off Control (2.3L Turbo) R EGR Valve Position/Pressure Feedback EGR Voltage Above Closed Limit (Others) C/O/R

RPM Too Low To Perform EGR Test (2.3L OHC & 3.8L CFI) R EGR Valve Position/EGR Pressure Feedback EGR Circuit Above Maximum Voltage (Others) -- Check for clogged converter C/O/R

System Indicates Lean At Idle R

System Indicates Rich At Idle R

DC Motor Idle Speed Control/Idle Tracking Throttle Position Sensor Open Circuit (2.3L CFI & 2.5L HSC) C

AXOD Converter Bypass Clutch Not Applying Properly C

System Indicates Lean R No HO2S Switching Detected C

System Indicates Rich R No O2S Switching Detected C

HO2S Lean At Wide Open Throttle (1986–90 1.9L MFI) C Throttle Position Sensor Below Idle Sped (Diesel) C

Secondary Air System Inoperative R

Secondary Air Upstream During Self Test R Coil 1 Primary Circuit Failure (1990–91 1.9L EFI/SFI, ) C Distributorless Ignition System Coil Pack 3 Circuit Failure (3.0L SHO 3.8L SC) C

Secondary Air Not Bypassed During Self Test R Coil 2 Primary Circuit Failure (1990–91 1.9L MFI/SFI) C Distributorless Ignition System Coil Pack 1 Circuit Failure (3.0L SHO 3.8L SC) C

4 X 4 Switch Is Closed O Measured Air Flow Low At Base Idle R

Loss Of Ignition Diagnostic Monitor LH Side (2.3L) C Measured Air Flow High At Base Idle (1986–90 1.9L EFI) R Distributorless Ignition System Coil Pack 2 Circuit Failure (3.0L SHO 3.8L SC) C

Spark Output (SPOUT) Signal Default To 10°. BDTC (3.0L SHO & 3.8L SC) C 1–2 Shift Error (Others) C

Engine Coolant Temperature Circuit Open --This code is usually because the test was run with a cold engine, and the computer is expecting to see the sensor reading an already warmed engine. (Technically you are supposed to warm the engine up, then shut it off before test is started). O/C

Power Steering Pressure Switch Circuit Open O Power Steering Pressure Switch Circuit Did Not Change States R

Throttle Position Sensor Circuit Above Maximum Voltage (4.5v) --The TPS is also supplied with 5v VREF and ground, and has a third wire that signals throttle opening by showing 1-4.5v, depending how much throttle is open. If the computer sees voltage over 4.5, the sensor is disconnected, broken, or a fault exists in the wiring between the sensor and the computer. C/O Fuel Injector Pump Lever Sensor Input Is Greater Than Self Test (Diesel) C/O

Intake Air Temperature/Air Charge Temperature Circuit Open --This one could also be due to the engine not being warmed up Or the sensor/wiring faults. This sensor has 5v supplied to it, and returns a signal voltage based on temperature. If voltage from this sensor reads above 4.6v, this code sets. C/O/R

Key Power Check -- or charging system problem R

Transmission Fluid Temperature Circuit Open C/O Mass Air Flow/Vane Air Flow Sensor Circuit Above Maximum Voltage C/O/R

Transaxle Neutral Position Switch Circuit Failed Open C

Idle Tracking Switch Circuit Open Or Grounded (CFI) O/R Vane Air Temperature Sensor Input Greater Than Self Test Maximum (EFI) C/O

AXOD Neutral Position Switch Circuit Failed Open (3.0L & 3.8L) C 2–3 Shift Error (Others) C Low Speed Fuel Pump Circuit Failure, Battery To PCM (3.0L SHO) C/O AXOD 4/3 Pressure Switch Circuit Failed Closed O AXOD 4/3 Pressure Switch Circuit Failed Open C

ECT Sensor Circuit Grounded C/O/R

Torque Converter Clutch Error C AXOD 4/3 Or 3/2 Pressure Switch Circuit Grounded O

Throttle Position Sensor Circuit Below Minimum Voltage C/O/R Fuel Injection Pump Lever Sensor Input Is Less Than Self Test Min. (Diesel) C/O

Intake Air Temperature/Air Charge Temperature Circuit Grounded C/O/R

Transmission Control Switch/Overdrive Cancel Switch Circuit Did Not Change States R Fuel Control (2.3L Turbo) C

Mass Air Flow Sensor Circuit Below Minimum Voltage (Except 1.9L MFI & 2.3L Turbo) C Vane Air Flow Sensor Input Less Than Self Test Minimum (1.9L MFI & 2.3L Turbo) O/C Transmission Fluid Temperature Circuit Grounded (Others) O/C

Park Neutral Position Switch Circuit Open; A/C On (Manual) O Manual Lever Position Sensor Out Of Range/A/C On O/C Clutch Switch Circuit Failure C A/C Input High (2.5L TBI) O/C

Idle Tracking Switch Closed (1.9L, 2.3L, 2.5L & 3.8L CFI) O/R Vane Air Temperature Sensor Input Less Than Self Test Minimum (1.9L MFI & 2.3L Turbo) O/C Transmission Fluid Temperature Transmission Over Temp (Overheated) (Diesel) C

3–4 Shift Error C AXOD Neutral Position Switch Failed Open (3.0L) C AXOD 3/2 Pressure Switch Failed Closed (3.8L SFI) C/O

EEC IV Data Transaxle Circuit Failed (3.8L SFI) C

Idle Tracking Switch Closed On Pre-Position (1.9L, 2.3L & 2.5L CFI) C Software Re-Initalization Detected (1.9L EFI) C Cluster Center Control Circuit Failed (3.8L SFI) C

Insufficient Manifold Absolute Pressure/Mass Air Flow Change During Dynamic Response Test R Power Interrupt Software Re-Initalization Detected (1.9L & 2.3L Turbo) C Message Center Control Assembly Circuit Failed (3.8L SFI) C

Insufficient Throttle Position Change During Dynamic Response Test O/R

Brake On/Off Circuit Open–Not During Self Test R/C

rake On/Off Circuit Closed/ECA Input Open R

Insufficient Vane Air Flow Sensor Output Change During Dynamic Response Test R

Operator Error Dynamic Response Test R

Re-Initalization Check R

A/C On/Defrost On During Self Test O

Secondary Air Diverter Circuit Failure O Turbo Boost (2.3L Turbo) O Insufficient IAS Output Voltage Change When Solenoid Is Activated (3.0L SHO) O

Secondary Air Bypass Circuit Failure O Integrated Relay Control Module (2.3L Turbo) O Supercharger Bypass Circuit Failure (3.8L SC) O

Integrated Relay Control Module (2.3L Turbo & 2.5L) O High Electric Drive Fan Circuit Failure (1.9L & 2.5L SFI) O EVP/EGRC/EGRV (2.3L OHC & 3.8L CFI) O Low Speed Fuel Pump Relay Circuit Open (3.0L SHO) C/O Integrated Relay Control Module (3.8L Turbo) O High Electric Drive Fan Circuit Failure (3.8L SFI & 3.8L SC) O

EGR Valve Position/Pressure Feedback EGR/EGR Control Circuit Failure O

Adaptive Fuel Lean Limit Reached (1.9L EFI) C Shift Solenoid 3/4–4/3 (2.3L Turbo) O CANP Circuit Failure (Others) O

Shift Solenoid Circuit Failure (2.9L 3.0L & 4.0L) O Adaptive Fuel Rich Limit Reached (1.9L EFI) C

Primary Fuel Pump Circuit Failure O/C Integrated Relay Control Module (2.3L Turbo & 2.5L & 3.8L MFI) O

Loss Of Dual Plug Input Control C Shift Solenoid 3/4–4/3 (2.3 Turbo) O Integrated Relay Control Module (2.5 L HSC & 3.8L EFI) O Electric Drive Fan Circuit Failure (2.5L, 3.0L SHO & 3.8L SFI) O Throttle Kicker Fault (5.0L) —

Converter Clutch Override Circuit Failure (2.9L, 3.0L & 4.0L) O Exhaust Heat Control (3.8L CFI) O

Shift Solenoid 1 Circuit Failure O HO2S Circuit Indicates Lean R No HO2S Switching Detected C

Shift Solenoid 2 Circuit Failure O HO2S Circuit Indicates Rich R

Throttle Position Sensor Input Low At Maximum D.C. Motor Extension (1.9L, 2.3L & 2.5L TBI) O Converter Clutch Solenoid Circuit Failure (Others) O

Torque Converter Clutch Solenoid Circuit Failure O Secondary Air Injection Inoperative R

Integrated Relay Control Module (2.5L HSC & 3.8L EFI) C/O Fuel Pump Circuit Open-PCM To Motor Ground (Others) C/O

Integrated Relay Control Module (2.5L HSC & 3.8L EFI) C/O High Speed Fuel Pump Relay Circuit Open (3.0L SHO) C/O Fuel Pump Circuit Open-Battery To PCM (Others) C/O

Transmission Control Indicator Lamp Circuit Failure O

Hard Fault Present R Electronic Pressure Control Driver Open In PCM (Diesel) O

Electronic Pressure Control Circuit Failure O/C Electronic Engine System Has Not Learned To Control Idle R

111

System Pass C/O/R

112

Intake Air Temperature/Air Charge Temperature Sensor Circuit Below Minimum Voltage C/O

113

Intake Air Temperature/Air Charge Temperature Sensor Circuit Above Maximum Voltage C/O

114

Intake Air Temperature/Air Charge Temperature Higher Or Lower Than Expected O/R

116

Engine Coolant Temperature Higher Or Lower Than Expected O/R

117

ECT Sensor Circuit Below Minimum Voltage C/O

118

ECT Sensor Circuit Above Maximum Voltage C/O

121

Closed Throttle Voltage Higher Or Lower Than Expected C/O/R

121

Indicates Throttle Position Voltage Inconsistent With Mass Air Flow Sensor C/O/R

122

Throttle Position Sensor Circuit Below Minimum Voltage C/O

123

Throttle Position Sensor Circuit Above Maximum Voltage C/O

124

Throttle Position Sensor Voltage Higher Than Expected C

125

Throttle Position Sensor Voltage Lower Than Expected C

126

Manifold Absolute Pressure/Barometric Pressure Sensor Higher Or Lower Than Expected C/O/R Cylinder Identification Circuit Failure (3.0L SHO) C

128

Manifold Absolute Pressure Sensor Vacuum Hose Damaged/Disconnected C

129

Insufficient Manifold Absolute Pressure/Mass Air Flow Change During Dynamic Response Test KOER R

136

System Indicates Lean (Bank No. 1) R

137

System Indicates Rich (Bank No. 2) R

138

Cold Start Injector Flow Insufficient R

139

No HO2S Switch Detected C

141

Flexible Fuel Control R

144

No HO2S Switch Detected C

157

Mass Air Flows Sensor Circuit Below Minimum Voltage C

158

Mass Air Flow Sensor Circuit Above Maximum Voltage C/O

159

Mass Air Flow Higher Or Lower Than Expected O/R

167

Insufficient Throttle Position Change During Dynamic Response Test R

171

Fuel System At Adaptive Limits C No HO2S Switching Detected C

172

HO2S System Indicates Lean C/R

173

HO2S System Indicates Rich R

174

HO2S Switching Time Is Slow C

175

Fuel System At Adaptive Limits (Bank No. 2) C

176

System Indicates Lean (Bank No. 2) C Insufficient TP Change During Dynamic Response Test (4.9L) R

177

System Indicates Rich (Bank No. 2) C

178

HO2S Switch Time Is Slow (Bank No. 1) C

179

Fuel System At Lean Adaptive Limit At Part Throttle, System Rich (1.9L, 2.0L. 2.3L HSC, 2.5L & 3.0L) C Fuel System Adaptive Lean Limit Is Reached (4.6L, 4.9L 5.0L, 5.8L, 7.0L & 7.5L) C Fuel System At Rich Adaptive Limit (Others) C

181

Fuel System At Rich Adaptive Limit At Part Throttle, System Lean (1.9L, 2.0L, 2.3L HSC, 2.5L & 3.0L) C Fuel System Adaptive Rich Limit Is Reached (4.6L, 4.9L, 5.0L, 5.8L ,7.0L & 7.5L) C Fuel System At Lean Adaptive Limit (Others) C

182

Fuel System At Lean Adaptive Limit At Idle, System Rich (1.9L, 2.3L, 2.5L, 3.0L, 3.8L SC, 4.6L ,7.0L & 7.5L) C Fuel System At Lean Adaptive Limit (Others) C

183

Fuel System At Rich Adaptive Limit At Idle, System Lean (1.9L, 2.3L, 3.0L, 3.8L SC, 4.6L, 7.0L & 7.5L) C Fuel System At Rich Adaptive Limit (Others) C

184

Mass Air Flow Sensor Circuit Voltage Higher Than Expected C

185

Mass Air Flow Sensor Circuit Voltage Lower Than Expected C

186

Injector Pulse Width Higher Than Expected (With BARO Sensor) C Injector Pulse Width Higher Or Mass Air Flow Lower Than Expected (Less BARO Sensor) C

187

Injector Pulse Width Lower Than Expected (With BARO Sensor) C Injector Pulse Width Lower Or MAF Higher Than Expected (Less BARO Sensor) C

188

Fuel System At Lean Adaptive Limit C

189

Fuel System At Rich Adaptive Limit C

191

Fuel System At Lean Adaptive Limit (Front) C

192

Fuel System At Rich Adaptive Limit (Front)

193

Flexible Fuel Sensor Circuit Failure O

211

Profile Ignition Pickup Circuit Failure C

212

Loss Of Ignition Diagnostic Module Input To PCM/SPOUT Circuit Grounded C

213

Spark Output (SPOUT) Circuit Open R

214

Cylinder Identification Circuit Failure C

215

PCM Detected Coil 1 Primary Circuit Failure (EI) C

216

PCM Detected Coil 2 Primary Circuit Failure (EI) C

217

PCM Detected Coil 3 Primary Circuit Failure (EI) C

218

Loss Of Ignition Diagnostic Module Signal LH Side (Dual Plug EI) C

219

Spark Timing Error C

221

Spark Timing Error C

222

Loss Of Ignition Diagnostic Module Signal RH Side (Dual Plug EI) C

223

Loss Of Dual Plug Ignition Control (Dual Plug EI) C

224

PCM Detected Coil 1,2,3 Or 4 Primary Circuit Failure (EI) C Erratic Ignition Diagnostic Module Input To Processor C Loss Of Tack Input To Processor/SPOUT Circuit Grounded (5.8L) C

225

Knock Not Sensed During Dynamic Response Test KOER R

226

Ignition Diagnostic Module Signal Not Received (EI) O

232

PCM Detected Coil 1, 2, 3 Or 4 Primary Circuit Failure (EI) C

238

PCM Detect Coil 4 Primary Circuit Failure C

244

Cylinder Identification Sensor Circuit Failure (2.0L) R

311

AIR System Inoperative/AIR System Inoperative During KOER (Bank No. 1 With Dual HO2S) R

312

AIR Misdirected During KOER R

313

AIR Not Bypassed During KOER R

314

AIR System Inoperative During KOER R

326

EGR Temperature Sensor Circuit Above Maximum Voltage (2.0L, 2.3L HSC & 3.0L SHO) C Pressure Feedback EGR Circuit Voltage Low (Others) C/R

327

EGR Circuit Below Minimum Voltage C/O/R

328

EGR Valve Position Sensor Closed Valve Voltage Lower Than Expected C/O/R

332

Insufficient EGR Flow Detected C/R

334

EGR Valve Position Sensor Closed Valve Voltage Higher Than Expected C/O/R

335

Pressure Feedback EGR Sensor Voltage Higher Or Lower Than Expected During KOEO O

336

Pressure Feedback EGR Circuit Voltage Higher Than Expected C/R

337

EGR Valve Position/Pressure Feedback EGR Circuit Above Maximum Voltage C/O/R

338

Engine Coolant Temperature Lower Than Expected C

339

Engine Coolant Temperature Higher Than Expected C

341

Octane Adjust Service Pin Open O

381

Erratic A/C Compressor Clutch Cycling C

411

Cannot Control RPM During KOER Low RPM Check R

412

Cannot Control RPM During KOER High RPM Check R

415

Idle Air Control Solenoid C

416

Idle Air Control Solenoid C

452

Insufficient Input From Vehicle Speed Sensor To PCM C

511

Read Out Memory Test Failure KOEO C/O/R

512

Keep Alive Memory Test Failure C

513

PCM Internal Voltage Failure (KOEO) C/O/R

519

Power Steering Pressure Switch Circuit Open KOEO O

521

Power Steering Pressure Switch Circuit Did Not Change States KOER R

522

Vehicle Not In Park Of Neutral During KOEO O

524

Low Speed Fuel Pump Circuit Open C/O

525

Vehicle In Gear With A/C On C/O

526

Neutral Position Switch Circuit Closed, A/C On O

527

Neutral Drive Switch Circuit Open, A/C On O

528

Clutch Position Switch Circuit Failure C

529

Data Communication Link Or Electronic Engine Controller Fault C

533

Data Communication Link To Electronic Instrument Cluster Fault C

536

Brake On/Off Circuit Failure/Not Actuated During KOER C/R

538

Insufficient RPM Change During KOER Dynamic Response Test R

538

Invalid Cylinder Balance Test Due To Throttle Movement During Test R

538

Invalid Cylinder Balance Test Due To Cylinder Identification Sensor Circuit Failure R

539

A/C On/Defrost On During KOEO O/R

542

Fuel Pump Circuit Open–PCM To Motor Ground C/O

543

Fuel Pump Circuit Open–Battery To Powertrain Control Module (PCM) C/O

551

Intake Air Control Circuit Failure KOEO O

552

AIR Bypass Circuit Failure KOEO O

553

AIR Bypass Circuit Failure KOEO O

554

Fuel Pump Relay Control Circuit Failure O

556

Fuel Pump Relay Primary Circuit Failure C/O

557

Low Speed Fuel Pump Primary Circuit Failure C/O

558

EGR Vacuum Regulator Circuit Failure O

559

A/C On Relay Circuit Failure O

563

High Speed Electric Fan Circuit Failure O

564

Electric Fan Circuit Failure O

565

Canister Purge Circuit Failure KOEO O

566

Shift Solenoid Circuit Failure KOEO O

569

Auxiliary Canister Purge Circuit Failure O

571

EGR Circuit Failure O

572

EGR Circuit Failure O

578

A/C Pressure Sensor Circuit C

579

Insufficient A/C Pressure Change C

581

Power To Fan Circuit Over Current C

582

Fan Circuit Open O

583

Power To Fuel Pump Over Current C

584

Power Ground Circuit Open C

585

Power To A/C Clutch Over Current C

586

A/C Clutch Circuit Open C

587

Vehicle Control Relay Module Communication Failure C/O

617

1–2 Shift Error C

618

2–3 Shift Error C

619

3–4 Shift Error C

621

Shift Solenoid 1 Circuit Failure KOEO C/O

622

Shift Solenoid 2 Circuit Failure KOEO C/O

623

Transmission Control Indicator Lamp Circuit Failure C/O

624

Electronic Pressure Control Circuit Failure C/O

625

Hard Fault Is Present (5.8L) C/O/R

625

Electronic Pressure Control Driver Open In PCM (Others) C/.O

626

Converter Clutch Solenoid Circuit Failure KOEO O

627

Torque Converter Clutch Solenoid Circuit Failure O

628

Excessive Torque Converter Clutch Slippage C

629

Torque Converter Clutch Solenoid Circuit Failure C

631

Transmission Control Indicator Lamp Circuit Failure KOEO O

632

Torque Converter Solenoid Circuit Did Not Change States During KOER C

633

4 X 4 Switch Closed During KOEO O

634

Manual Lever Position Sensor Voltage Higher Or Lower Than Expected C/O

636

Transmission Fluid Temperature Higher Or Lower Than Expected O/R

637

Transmission Fluid Temperature Sensor Circuit Above Maximum Voltage C/O

638

Transmission Fluid Temperature Sensor Circuit Below Minimum Voltage C/O

639

Insufficient Input From Turbine Speed Sensor C/R

641

Shift Solenoid 3 Circuit Failure C/O

643

Torque Converter Clutch Circuit Failure C/O

645

Improper Gear Ratio In 1st Gear C

646

Improper Gear Ratio In 2nd Gear C

647

Improper Gear Ratio In 3rd Gear C

648

Improper Gear Ratio In 4th Gear C

649

Electronic Pressure Control Higher Or Lower Than Expected C

651

Electronic Pressure Control Circuit Failure C

652

Torque Converter Clutch Solenoid Circuit Failure C

653

Torque Converter Solenoid Did Not Change States During KOER R

654

Manual Lever Position Sensor Indicating Not In Park During Self Test O

655

Manual Lever Position Sensor Indicating Not In Neutral During Self Test —

656

Torque Converter Clutch Slippage Error C

657

Transmission Over Temp Condition C

659

High Vehicle Speed In Park Indicated R

662

Shift Solenoid 2 Circuit O

667

Transmission Range Sensor Circuit Below Minimum Voltage C/O

668

Transmission Range Sensor Circuit Above Maximum Voltage C/O

675

Transmission Range Sensor Circuit Voltage Out Of Range O/R

998

Hard Fault Present O/R

ACT = Air Charge Temperature Sensor
BP = See MAP
EEC = Electronic Engine Control System
ECT = Engine Coolant Temperature Sensor
EGR = Exhaust Gas Recirculation Valve
EVP = EGR Valve Position Sensor
HEGO = Heated Exhaust Gas Oxygen Sensor
KOEO = Key On Engine Off
KOER = Key On Engine Running
MAF = Mass Air Flow Sensor
MAP = Manifold Absolute Pressure Sensor
MLP = Manual Lever Position
PCM = Powertrain Control Module
SPOUT = Distributor Jumper to Allow Initial Timing
TP = Throttle Position Sensor

You can read more about these systems HERE.

Posted by: vaniavelk.blogspot.com

Source: http://91fordranger.blogspot.com/2012/12/

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Schematics Diagram For The Wiring In A Ford Ranger 1991

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