EEC IV 3 DIGIT CODES

[EEC Tests]

Applicable only to some 1991 and up vehicles

NOTE: When you see "is/was" listed for a code:
For a HARD fault code the sensor IS out of range right now.
For a MEMORY code, it WAS out of range at one time (possible intermittent wire etc.).

Differences in test mode noted as:

(O) =Key On Engine Off test
(R) =Key On Engine Running test
(M) =Memory code

111 System checks OK

112 (O,M) Intake Air Temperature (IAT) sensor is/was low or grounded

113 (O,M) IAT sensor is/was high or open

114 (O,R) IAT sensor out of range

116 (O,R) Engine Coolant (ECT) sensor out of range

117 (O,M) ECT sensor is/was low or grounded

118 (O,M) ECT sensor is/was high or open

121 (O,R,M) Throttle Position (TP) sensor out of range

122 (O,M) TP low (possibly grounded or open circuit)

123 (O,M) TP is/was high or short to power

124 (M) TP voltage was higher than expected

125 (M) TP voltage was lower than expected

126 (O,R,M) MAP or BARO sensor out of range

128 (M) MAP vacuum has not been changing - check vacuum lines

129 (R) No MAP or Mass Air Flow sensor change during "goose" test

136 (R) Oxygen sensor not switching/system lean Left or Front HO2S

137 (R) Oxygen sensor not switching/system rich Left or Front HO2S

138 (R) Fault in Cold Start Injector circuit

139 (M) Oxygen sensor not switching Left or Front HO2S

144 (M) Oxygen sensor not switching Single, Right or Rear HO2S

157 (R,M) Mass Air Flow signal is/was low or grounded

158 (O,R,M) MAF sensor is/was high or short to power

159 (O,R) MAF sensor is/was out of range

167 (R) No Throttle Position sensor change in "goose" test (must get at least 25% rotation)

171 (M) Oxygen sensor not switching - system was at adaptive limits - Single, Right or Rear HO2S

172 (R,M) Oxygen sensor not switching - system is or was lean - Single, Right or Rear HO2S

173 (R,M) Oxygen sensor not switching - system is or was rich - Single, Right or Rear HO2S

174 (M) Oxygen sensor was slow in switching Single, Right or Rear HO2S

175 (M) Oxygen sensor not switching - system was at adaptive limits - Left or Front HO2S

176 (M) Oxygen sensor not switching - system is or was lean Left or Front HO2S

177 (M) Oxygen sensor not switching - system was rich Left or Front HO2S

178 (M) Oxygen sensor was slow in switching Left or Front HO2S

179 (M) Fuel system was rich at part throttle Single, Right or Rear HO2S

181 (M) Fuel system was lean at part throttle Single, Right or Rear HO2S

182 (M) Fuel system was rich at idle Single, Right or Rear HO2S

183 (M) Fuel system was lean at idle Single, Right or Rear HO2S

184 (M) Mass Air (MAF) output higher than expected

185 (M) Mass Air (MAF) output lower than expected

186 (M) Injector pulse width longer than expected or Mass Air Flow (MAF) lower than expected

187 Injector pulse width shorter than expected or Mass Air Flow (MAF) higher than expected

188 (M) Fuel system was rich at part throttle - Left or Front HO2S

189 (M) Fuel system was lean at part throttle - Left or Front HO2S

191 (M) Fuel system was rich at idle - Left or Front HO2S

192 (M) Fuel system was lean at idle - Left or Front HO2S

193 Failure in Flexible Fuel (FF) sensor circuit

194 (M) Perform cylinder balance test to check for inoperative injectors

195 (M) Perform cylinder balance test to check for inoperative injectors

211 (M) Ignition PIP signal was erratic or missing

212 (M) Ignition TACH signal was erratic (module/wiring) or SPOUT circuit fault

213 (R) Ignition SPOUT or SAW circuit open or shorted

214 (M) Error in Cylinder ID (CID) circuit or signal

215 (M) Primary circuit failure - ignition coil 1

216 (M) Primary circuit failure - ignition coil 2

217 (M) Primary circuit failure - ignition coil 3

218 (M) IDM signal open or high or left coil pack failure

219 (M) SPOUT circuit failure, timing defaulted to 10 degrees - follow code 213 diagnosis

222 (M) IDM open or high or right coil pack failure

223 (M) Dual Plug (DPI), SPOUT or IDM circuit fault

224 (M) Failure in ignition coil primary circuit

225 (R) Knock sensor not tested (ignore if not pinging)

226 (O) Ignition Diagnostic Monitor (IDM) signal fault

232 (M) EI primary coil circuit failure

238 (M) EI primary circuit failure - ignition coil 4

311 (R) AIR system not working - Single, Right or Rear HO2S

312 (R) AIR not diverting

313 (R) AIR not bypassing

314 (R) AIR inoperative, Left or Front HO2S

326 (R,M) Pressure Feedback EGR shows low pressure EGR not seating or not seating intermittantly

327 (O,R,M) EGR feedback signal is/was low

328 (O,R,M) EGR Valve Position (EVP) is/was low

332 (R,M) EGR did not open/respond during test or if memory code, did not open intermittantly

334 (O,R,M) EVP sensor is/was high

335 (O) EGR feedback signal is/was out of range

336 (O,R,M) PFE sensor signal is/was was high

337 (O,R,M) EGR feedback signal is/was was high

338 (M) Cooling system did not heat up (check cooling system / thermostat operation)

339 (M) Cooling system overheated (check cooling system / thermostat operation)

341 (O) Octane jumper installed (information only code to notify you if it is installed)

411 (R) Idle speed system not controlling idle properly (generally idle too high)

412 (R) Idle speed system not controlling idle properly (generally idle too low)

452 (M) Vehicle Speed Sensor (VSS) problem

511 (O) No power to PCM pin 1 or bad PCM (processor)

512 (M) Memory power (PCM pin 1) was interrupted - Was battery disconnected ?

513 (O) Replace processor (PCM) (internal failure)

519 (O) PSP switch/circuit open

521 (R) Wheel not turned during test or PSP problem

522 (O) Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault Transmission MLP sensor out of range in park

524 Problem in low speed fuel pump circuit

525 (O,M) Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault

528 (M) System shows voltage at pin 10 (is A/C on ?) or pin 30 (PNP, CPP switch)

529 (M) Data Communications Link to processor failure
Service any EEC codes, erase memory and retest. If code is still present refer to instrument cluster diagnosis manual.

533 (M) Data Communications Link to instrument cluster failure - see 529

536 (O,R,M) Brake On Off open or shorted to ground

538 (R) System did not receive "goose" test - TESTS

539 (O) System shows voltage at PCM pin 10. Is A/C on ?

542 (O,M) Fuel pump open, bad ground or always on -

543 (O) Fuel pump monitor circuit shows no power (M) (Service 556 code first if present) Fuel pump relay or battery power feed was open

551 Problem in Intake Manifold Runner Control (IMRC) solenoid/circuit

552 (O) AIRB solenoid/circuit failure

553 (O) AIRD solenoid/circuit failure

554 (O) Fuel Press Regulator Control solenoid/circuit fault

556 (O,M) Fuel pump relay primary circuit fault

557 (O,M) Low speed pump relay primary circuit fault

558 (O) EGR vacuum regulator solenoid/circuit failure

559 (O) A/C relay primary circuit fault

563 (O) High Fan Control (HFC) circuit failure

564 (O) Fan Control (FC) circuit failure

565 (O) Canister Purge 1 solenoid/circuit failure

566 (O) transmission 3/4 shift solenoid/circuit

569 (O) Canister Purge 2 solenoid/circuit failure

578 (M) A/C pressure sensor VREF short to ground

579 (M) ACP sensor did not change with A/C on

581 (M) Cooling fan current was excessive

582 (O) Open cooling fan circuit

583 (M) Fuel pump current was excessive

584 (M) Open power ground circuit

585 (M) A/C clutch current was excessive

586 (M) Open circuit in A/C clutch

587 (O, M) Communication problem between PCM and Variable Control Relay Module (VCRM)

617 (M) Transmission shift failure (1/2 shift)

618 (M) Transmission shift failure (2/3 shift)

619 (M) Transmission shift failure (3/4 shift)

621 (O) Solenoid/circuit failure - shift solenoid 1

622 (O) Solenoid/circuit failure - shift solenoid 2

624 (O,M) Solenoid/circuit failure -Electronic Pressure Control (EPC) current is high

625 (O,M) Solenoid/circuit failure - Electronic Pressure Control (EPC) current is low

626 (O) Transmission Coast Clutch (CCS) Solenoid/circuit fault

627 (O) Torque Converter Clutch circuit fault

628 (M) Excessive converter clutch slippage

629 (O,M) Torque Converter Clutch circuit fault

631 (O) Overdrive Cancel Light circuit problem

632 (R) E4OD - Transmission Control Switch (TCS) should be cycled once between engine ID and Goose test

633 (O) 4x4L switch should be in 4x2 or 4x4 high for the test

634 (O,M) Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault
Electronic shift transmission - Manual Lever Position (MLP) sensor out of range in PARK

636 (O,R) Transmission Oil Temperature (TOT) sensor out of range

637 (O,M) TOT sensor is/was high or open

638 (O,M) TOT sensor is/was low or grounded

639 (R,M) Transmission Speed sensor (TSS) circuit fault

641 (O) Transmission solenoid/circuit failure Shift Solenoid 3

643 (O)(M) Torque Converter Clutch (TCC) circuit

645 (M) Transmission 1st gear failure

646 (M) Transmission 2nd gear failure

647 (M) Transmission 3rd gear failure

648 (M) Transmission 4th gear failure

649 (M) Transmission EPC system failure

651 (M) Transmission EPC solenoid/circuit fault

652 (O) Torque Converter Clutch (TCC) circuit fault

654 (O) Transmission selector not in PARK

656 (M) Torque Converter Clutch (TCC) slip

657 (M) Transmission temperature was excessive

998 (R) Did not pass Key On Engine Off test yet (Get 111 in KOEO first)
(O) Transmission Electronic Pressure Control (EPC) solenoid/circuit fault [EEC Tests]

Copyright 1997-2003 Dali Design - No part of this document may be reproduced without written permission from the author.


Dali Design, Berlin, MD

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