Jeep XJ. Manual — part 819
TEST
ACTION
APPLICABILITY
3
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
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 DRB Freeze Frame information. 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
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER-1.
No
→
Test Complete.
37
COMMUNICATION
P1698-NO BUS MESSAGE FROM TRANS CONTROL MODULE —
Continued
Symptom:
*NO RESPONSE FROM PCM-ENGINE STARTS (GAS ONLY)
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH ANOTHER VEHICLE
CHECK PCM POWERS AND GROUNDS
TRANSMISSION CONTROL MODULE
CONTROLLER ANTILOCK BRAKE
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT OPEN
SCI TRANSMIT CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: Make sure the vehicle starts and runs before proceeding, if not refer
to the appropriate symptom for a no response and a no start condition.
Connect the DRB to another vehicle.
Will the DRB communicate with this vehicle?
All
Yes
→
No
→
Repair or replace the DRB or DRB cable as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
Did the vehicle pass this test?
All
Yes
→
No
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
3
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
4
Turn the ignition off.
Disconnect the TCM harness connector (if equipped).
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Replace the Transmission Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
38
COMMUNICATION
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the CAB harness connector (if equipped).
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the SCI Transmit circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
Replace the Controller Antilock Brake.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
6
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Receive circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the SCI Receive circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
7
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Receive circuit between the PCM C3 connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the SCI Receive circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
8
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Transmit circuit between the PCM C3 connector
and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the SCI Transmit circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
9
NOTE: Ensure the SCI Transmit and Receive circuits are not shorted to
voltage, damage to the PCM may result.
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
39
COMMUNICATION
*NO RESPONSE FROM PCM-ENGINE STARTS (GAS ONLY) —
Continued
Symptom:
P0107-MAP SENSOR VOLTAGE TOO LOW
When Monitored and Set Condition:
P0107-MAP SENSOR VOLTAGE TOO LOW
When Monitored:
With the engine RPM above 416 but less than 1500, the TPS voltage
less than 1.13 volts, and battery voltage greater than 10.4 volts.
Set Condition:
The MAP sensor signal voltage is below 0.1 volt for 2.0 seconds with the
engine running.
POSSIBLE CAUSES
MAP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
INTERMITTENT CONDITION
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5 VOLT SUPPLY CIRCUIT OPEN
MAP SENSOR INTERNAL FAILURE
PCM 5 VOLT SUPPLY CIRCUIT
PCM MAP SENSOR SIGNAL
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the MAP Sensor voltage.
Is the voltage below 1.2 volts?
All
No
→
Yes
→
2
Start the engine.
With the DRBIII
t, read the MAP Sensor voltage.
Is the voltage below .04 volts?
All
Yes
→
No
→
40
DRIVEABILITY - GAS
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