Always begin by reading the diagnostic trouble
codes using the DRBIII
t. This will direct you to the
specific test(s) that must be performed.
3.3.1
HARD CODE
A diagnostic trouble code that comes back within
one cycle of the ignition key is a “hard” code. This
means that the fault is there every time the power-
train control module/engine control module/sentry
key immobilizer system checks that circuit or func-
tion. Procedures in this manual verify if the trouble
code is a hard code at the beginning of each test.
When it is not a hard code, an “intermittent” test
must be performed.
3.3.2
INTERMITTENT CODE
A diagnostic trouble code that is not there every
time the powertrain control module/engine control
module/sentry key immobilizer system checks the
circuit is an “intermittent” code. Most intermittent
codes are caused by wiring or connector problems.
Faults that come and go like this are the most
difficult to diagnose; they must be looked for under
specific conditions that cause them. The following
checks may assist you in identifying a possible
intermittent problem:
•
Visually inspect related wire harness connectors.
Look for broken, bent, pushed out, or corroded
terminals.
•
Visually inspect the related harnesses. Look for
chafed, pierced, or partially broken wire.
•
Refer to any hotlines or technical service bulle-
tins that may apply.
NOTE: Electro-magnetic (Radio) interference can
cause intermittent system malfunctions.
3.3.3
ECM DIAGNOSTIC TROUBLE CODES
A/C Control Open Circuit
A/C Control Short Circuit
Accelerator Pedal Sensor PWG Plausibility With
Potentiometer
Accelerator Pedal Sensor Supply High Exceeded
Accelerator Pedal Sensor Supply Low Exceeded
Accelerator Pedal Sensor Plausibility
Accelerator Pedal Sensor Signal High Exceeded
Atmosphere Pressure Sensor SRC High Exceeded
Atmosphere Pressure Sensor SRC Low Exceeded
Battery Voltage SRC High Exceeded
Brake Signal Plausibility With Redundant Con-
tact
Control Sleeve Sensor Signal Low Exceeded
Control Sleeve Sensor Start End Position Not
Attained
Control Sleeve Sensor Stop End Position Not
Attained
Turbocharger Boost Sensor Signal High Exceeded
Turbocharger Boost Sensor Signal Low Exceeded
Turbocharger Boost Sensor Supply High Ex-
ceeded
Turbocharger Boost Sensor Supply Low Exceeded
Turbocharger Boost Sensor Plausibility
EEPROM Plausibility Checksum Error in CC212
EEPROM Plausibility Checksum Error For Adj.
(EGR)
EEPROM Plausibility VIN Checksum Error
EEPROM Plausibility Communication With EE-
PROM
EEPROM Plausibility Ver Number Not Corre-
sponding
EEPROM Plausibility Func Switch Wrong or
Missing
EGR Open Circuit
EGR Short Circuit
Engine Speed Sensor Dynamic Plausibility
Engine Speed Sensor Overspeed Recognition
Engine Speed Sensor Static Plausibility
Fuel Quantity Actuator Negative Governor Devi-
ation Cold
Fuel Quantity Actuator Negative Governor Devi-
ation Warm
Fuel Quantity Actuator Positive Governor Devia-
tion Cold
Fuel Quantity Actuator Positive Governor Devia-
tion Warm
Fuel Temperature Sensor SRC High Exceeded
Fuel Temperature Sensor SRC Low Exceeded
Glow Relay #1 Controller Open Circuit
Glow Relay #2 Controller Open Circuit
Glow Relay #1 Controller Short Circuit
Glow Relay #2 Controller Short Circuit
Inductive Auxiliary Speed Sensor Dynamic Plau-
sibility
Inductive Auxiliary Speed Sensor Overspeed Rec-
ognition
Inductive Auxiliary Speed Sensor Plausibility
Inductive Auxiliary Speed Sensor Static Plausi-
bility
Air Temperature Sensor SRC High Exceeded
Air Temperature Sensor SRC Low Exceeded
Microcontroller Recovery Has Occurred
Microcontroller Prepare Fuel Quantity Stop
Microcontroller Redundant Overrun Monitoring
Microcontroller Gate-Array Monitoring
Microcontroller Gate-Array Watchdog
Needle Movement Sensor SRC High Exceeded
Needle Movement Sensor SRC Low Exceeded
Redundant Emergency Stop Plausibility In After-
Run
Redundant Emergency Stop Powerstage Defec-
tive
Regulator Lower Regulator Limit
Regulator Upper Regulator Limit
Solenoid Valve Controller Open Circuit
Solenoid Valve Controller Short Circuit
4
GENERAL INFORMATION