Page 575 of 2305

TEST ACTION APPLICABILITY
7 Turn the ignition off.
Remove and inspect the Air Filter for soiling or excessive dirt and debris which may
cause air flow restriction.
Were any of these problems found?All
Ye s!Replace the Air Filter element.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 8
8NOTE: Inspect all air intake and turbocharger related tubes for damage,
restriction or poor connection. Any of these conditions can cause a this DTC
to set.
NOTE: Inspect the exhaust system and related tubes for damage, restriction
or poor connection. Any of these conditions can cause a this DTC to set.
Turn the ignition off.
Inspect the intake system, exhaust system and related tubes and connections.
Were any problems found?All
Ye s!Repair or replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 9
9 Turn the ignition off.
Remove the Intake Air Temperature Sensor.
Connect smoke machine 84-04 to the Intake Air Temperature Sensor port in the
intake duct and begin injecting smoke into the intake system.
Observe all intake system components for evidence of smoke leakage.
Is there evidence of smoke leakage?All
Ye s!Repair or replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Replace the MAF Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
10WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?All
Ye s!Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Test Complete.
152
DRIVEABILITY - DIESEL
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY ÐContinued
Page 576 of 2305
Symptom List:
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO
HIGH
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO
LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2066-MASS AIR FLOW SENSOR
PLAUSIBILITY AIR MASS TOO HIGH.
When Monitored and Set Condition:
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO HIGH
When Monitored: With the engine running.
Set Condition: The ECM detects excessive air flow from the MAF Sensor.
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO LOW
When Monitored: With the engine running.
Set Condition: The ECM detects low air flow from the MAF Sensor.
POSSIBLE CAUSES
AIR FILTER
AIR RESTRICTION
CHECKING FOR AIR LEAKS
MASS AIRFLOW SENSOR
INTERMITTENT CONDITION
153
DRIVEABILITY - DIESEL
Page 577 of 2305

TEST ACTION APPLICABILITY
1NOTE: If DTC P1611, P2306 or P2332 is present with this DTC, diagnose
DTCs P1611, P2306 or P2332 before diagnosing this DTC.
NOTE: Inspect all air intake and turbocharger related tubes for damage,
restriction or poor connection. Any of these conditions can cause a this DTC
to set.
NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRBIIIt, erase the ECM DTCs.
Test drive the vehicle.
With the DRBIIIt, read the ECM DTCs.
Does the DRB III display a Mass Air Flow Sensor DTC?All
Ye s!Go To 2
No!Go To 5
2 Turn the ignition off.
Remove and inspect the Air Filter for soiling or excessive dirt and debris which may
cause air flow restriction.
Were any of these problems found?All
Ye s!Replace the Air Filter element.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 3
3NOTE: Inspect all air intake and turbocharger related tubes for damage,
restriction or poor connection. Any of these conditions can cause a this DTC
to set.
NOTE: Inspect the exhaust system and related tubes for damage, restriction
or poor connection. Any of these conditions can cause a this DTC to set.
Turn the ignition off.
Inspect the intake system, exhaust system and related tubes and connections.
Were any problems found?All
Ye s!Repair or replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 4
4 Turn the ignition off.
Remove the Intake Air Temperature Sensor.
Connect smoke machine 84-04 to the Intake Air Temperature Sensor port in the
intake duct and begin injecting smoke into the intake system.
Observe all intake system components for evidence of smoke leakage.
Is there evidence of smoke leakage?All
Ye s!Repair or replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Replace the MAF Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
154
DRIVEABILITY - DIESEL
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO HIGH Ð
Continued
Page 578 of 2305

TEST ACTION APPLICABILITY
5WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?All
Ye s!Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Test Complete.
155
DRIVEABILITY - DIESEL
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO HIGH Ð
Continued
Page 579 of 2305
Symptom:
P2087-INTAKE PRESSURE SENSOR INTAKE RESTRICTION
When Monitored and Set Condition:
P2087-INTAKE PRESSURE SENSOR INTAKE RESTRICTION
When Monitored: With the ignition on.
Set Condition: The ECM detects a rationality problem with the MAF Sensor.
POSSIBLE CAUSES
RESTRICTED INTAKE SYSTEM
Repair Instructions:
RESTRICTED INTAKE SYSTEM
This DTC indicates a restriction in the intake system. Check for clogged air filter, collapsed
hoses, or other conditions that could cause restricted air flow through the intake system.
Repair or replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
156
DRIVEABILITY - DIESEL
Page 603 of 2305

Symptom List:
P2203-TORQUE REDUCTION MESSAGE FROM ABS - CAN PLAUSI-
BILITY
P2203-TORQUE REDUCTION MESSAGE FROM ABS - MESSAGE
ERROR
P2203-TORQUE REDUCTION MESSAGE FROM ABS - MESSAGES
MISSING
P2203-TORQUE REDUCTION MESSAGE FROM ABS - NO COMMUN-
IOCATION
P2203-TORQUE REDUCTION MESSAGE FROM ABS - PLAUSIBIL-
ITY #1
P2203-TORQUE REDUCTION MESSAGE FROM ABS PLAUSIBILITY
#2
P2208-ABS BRAKE SIGNAL CAN MESSAGE IMPLAUSIBLE
P2208-ABS CAN BRAKE SIGNAL PLAUSIBILITY
P2209-ABS CAN MESSAGE MISSING OR INCORRECT
P2253-STEERING ANGLE SENSOR PLAUSIBILITY
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2203-TORQUE REDUCTION
MESSAGE FROM ABS - CAN PLAUSIBILITY.
POSSIBLE CAUSES
CAB DTCS
ENGINE CONTROL MODULE
VERIFY CAB COMMUNICATION
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIItattempt to communicate with the CAB.
NOTE: If there are other DTCs set with this DTC, refer to the Symptom List
and repair other stored ECM DTCs before diagnosing this DTC.
Is the CAB communicating with the DRB?All
Ye s!Go To 2
No!Refer to the appropriate symptom in the Body Diagnostic Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
180
DRIVEABILITY - DIESEL
Page 607 of 2305

Symptom List:
P2210-ESM CAN MESSAGE MISSING OR INCORRECT
P2234-ABS DTC EXTERNAL QUANTITY CONTROL FAULT
PRESENT
P2252-LATERAL ACCELERATOR SENSOR PLAUSIBILTY
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2210-ESM CAN MESSAGE
MISSING OR INCORRECT.
POSSIBLE CAUSES
ABS MODULE
CAN BUS CIRCUITS OPEN
INTERMITTENT CONDITION
ABS DTCS
TEST ACTION APPLICABILITY
1NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
NOTE: This DTC indicates a communication problem between the TCM and
the ECM.
Turn the ignition on.
With the DRBIIIt, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds
between each engine run cycle.
With the DRBIIIt, read the ECM DTCs.
Did this DTC set again?All
Ye s!Go To 2
No!Go To 4
2 Turn the ignition on.
With the DRBIIIt, attempt to read ABS DTCs.
NOTE: If the DRB is unable to communicate with the ABS Module, refer to
the symptom list for problem related to ABS Module Communication.
Are there any ABS DTCs?All
Ye s!Refer to symptom list for problems related to ABS DTC's.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 3
184
DRIVEABILITY - DIESEL
Page 611 of 2305

Symptom List:
P2217-TCM DTC INTERNAL FAULT PRESENT
P2218-TCM DTC 1-2 AND 4-5 SHIFT SOLENOID FAULT PRESENT
P2219-TCM DTC 2-3 SHIFT SOLENOID FAULT PRESENT
P2220-TCM DTC 3-4 SHIFT SOLENOID FAULT PRESENT
P2221-TCM DTC TORQUE CONVERTER CLUTCH SOLENOID
FAULT PRESENT
P2222-TCM DTC MODULATING PRESSURE SOLENOID FAULT
PRESENT
P2223-TCM DTC SHIFT PRESSURE SOLENOID FAULT PRESENT
P2224-TCM DTC VALVE VOLTAGE SUPPLY FAULT PRESENT
P2225-TCM DTC SPEED SENSOR VOLTAGE FAULT PRESENT
P2226-TCM DTC EWM CAN MESSAGE FAULT PRESENT
P2227-TCM DTC RIGHT REAR WHEEL SPEED IMPLAUSIBLE
FAULT PRESENT
P2228-TCM DTC TRANSMISSION RATIO ERROR FAULT PRESENT
P2229-TCM DTC CAN MSG IMPLAUSIBLE FAULT PRESENT
P2230-TCM DTC TCC EXCESSIVE POWER CONSUMPTION FAULT
PRESENT
P2231-TCM DTC NOT UNEQUIVOCAL FAULT PRESENT
P2232-TCM DTC NEGATIVE GEAR COMPARISON FAULT PRESENT
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2217-TCM DTC INTERNAL
FAULT PRESENT.
POSSIBLE CAUSES
VERIFY CURRENT DTC
188
DRIVEABILITY - DIESEL