Jeep XJ. Manual — part 824
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Sensor ground circuit from the MAP Sensor harness
connector to the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Sensor Ground circuit for high resistance.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
8
Turn the ignition off.
Disconnect the TPS harness connector.
With the DRBIII
t, monitor the TPS voltage.
Turn the ignition on.
Connect a jumper wire between the TPS Signal circuit and the Sensor ground circuit
.
Does the DRBIII
t display TPS voltage from approximately 4.9 volts to below 0.5 volt?
All
Yes
→
Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
9
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Throttle Position Sensor Signal circuit from the
Throttle Position Sensor harness connector to the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Throttle Position Sensor Signal circuit for high resis-
tance.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Throttle Position Sensor Signal circuit from the
Throttle Position Sensor harness connector to ground.
Is the resistance above 5 ohms?
All
Yes
→
No
→
Repair the Throttle Position Sensor Signal circuit for high resis-
tance to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
11
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Sensor ground circuit from the Throttle Position
Sensor harness connector to the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Sensor Ground circuit for high resistance.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
57
DRIVEABILITY - GAS
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP —
Continued
TEST
ACTION
APPLICABILITY
12
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
13
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit from the MAP Sensor harness
connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for high resistance.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
14
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit from the MAP Sensor harness
connector to ground.
Is the resistance above 5 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for high resistance to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
15
Turn the ignition off.
Disconnect the TPS harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit from the TP Sensor harness
connector to the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for high resistance.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
16
Turn the ignition off.
Disconnect the TPS harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit from the TP Sensor harness
connector to ground.
Is the resistance above 5 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for high resistance to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
58
DRIVEABILITY - GAS
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP —
Continued
TEST
ACTION
APPLICABILITY
17
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
With the DRBIII
t, monitor the MAP Sensor voltage.
Turn the ignition on.
Connect a jumper wire between the MAP Sensor Signal circuit and the Sensor
ground circuit .
Cycle the ignition switch from off to on.
With the DRBIII
t, monitor the MAP Sensor voltage.
Does the DRBIII
t display MAP voltage from approximately 4.9 volts to below 0.5
volt?
All
Yes
→
Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
18
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the MAP Sensor Signal circuit from the MAP Sensor
harness connector to the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the MAP Sensor Signal circuit for high resistance.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
19
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the MAP Sensor Signal circuit from the MAP Sensor
harness connector to ground.
Is the resistance above 5 ohms?
All
Yes
→
No
→
Repair the MAP Sensor Signal circuit for high resistance to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
20
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Sensor ground circuit from the MAP Sensor harness
connector to the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Sensor Ground circuit for high resistance.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
21
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
59
DRIVEABILITY - GAS
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP —
Continued
TEST
ACTION
APPLICABILITY
22
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 DRBIII
t 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 - 5.
No
→
Test Complete.
60
DRIVEABILITY - GAS
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP —
Continued
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