337-459

NOTE
KOEO refers to Key On Engine Off (KOEO)
KOER refers to Key On Engine Running (KOER)
DTC refers to Diagnostic Trouble Code (DTC)
DTCs should be diagnosed in the order they are received.


DTC 337
Differential Pressure Feedback EGR (DPFE) sensor circuit above maximum voltage (California vehicles).

KOEO Hard Code Go to DL5
DL5 - Induce DTC 327

KOER Hard Code Go to DL50
DL50 - Code 336 or 337: Check For EVR Malfunction

KOEO Memory Code Go to DL90
DL90 - All Continuous Memory EGR DTC: Intermittent Verification

DTC 337
Pressure Feedback EGR (PFE) sensor circuit above maximum voltage (Federal vehicles).

KOEO Hard Code Go to DL5
DL5 - Induce DTC 327

KOER Hard Code Go to DL25
DL25 - Check Exhaust Restriction

KOEO Memory Code Go to DL90
DL90 - All Continuous Memory EGR DTC: Intermittent Verification

DTC 338
Engine coolant temperature lower than expected (thermostat test).

KOEO Memory Code Go to DA100
DA100 - Engine Too Cold

DTC 339
Engine coolant temperature higher than expected (thermostat test).

KOEO Memory Code Go to DA101
DA101 - Engine Too Hot

DTC 341
Octane adjust service pin open.

KOEO Hard Code Go to KP1
KP1 - Inspect Octane Adjust Inline Connector

DTC 381
Frequent A/C clutch cycling.

KOEO Memory Code Go to X130
X130 - Check For Causes of Fast A/C Compressor Cycling

DTC 411
Cannot control RPM during KOER self-test low RPM check.

KOER Hard Code Go to KE15
KE15 - Engine RPM Error During Self-Test

DTC 412
Cannot control RPM during KOER self-test high RPM check.

KOER Hard Code Go to KE1
KE1 - Check For RPM Drop

DTC 415
Idle Air Control system at maximum adaptive lower limit.

KOEO Memory Code Go to KE30


DTC 416
Idle Air Control system at upper adaptive learning limit.

KOEO Memory Code Go to KE35


DTC 452
Insufficient input from vehicle speed sensor to powertrain control module.

KOEO Memory Code Go to DP1
DP - Vehicle Speed Sensor (VSS)

DTC 453
Servo leaking down (KOER IVSC test).

Refer to Cruise Control / Testing and Inspection.

DTC 454
Servo leaking up (KOER lVSC test)

Refer to Cruise Control / Testing and Inspection.

DTC 455
Insufficient RPM increase (KOER IVSC test).

Refer to Cruise Control / Testing and Inspection.

DTC 456
Insufficient RPM decrease (KOER IVSC test)

Refer to Cruise Control / Testing and Inspection.

DTC 457
Speed control command switch(s) circuit not functioning (KOEO IVSC test)


Refer to Cruise Control / Testing and Inspection.

DTC 458
Speed control command switch(s) stuck/circuit grounded (KOEO IVSC test)

Refer to Cruise Control / Testing and Inspection.

DTC 459
Speed control ground circuit open (KOEO IVSC test)

Refer to Cruise Control / Testing and Inspection.