Jeep Wrangler TJ. Manual — part 87
Symptom:
P0118-ENGINE
COOLANT
TEMPERATURE
SENSOR
CIRCUIT
HIGH
When Monitored and Set Condition:
P0118-ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT HIGH
When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
Set Condition:
The Engine Coolant Temperature (ECT) sensor circuit voltage at the PCM
is greater than 4.96 volts for more than 2.6 seconds. One Trip Fault.
POSSIBLE CAUSES
ECT SENSOR VOLTAGE ABOVE 4.96 VOLTS
ECT SENSOR
(K2) ECT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K2) ECT SIGNAL CIRCUIT OPEN
(K900) SENSOR GROUND CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read the ECT Sensor voltage.
Is the voltage above 4.96 volts?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Connect a jumper wire between the (K2) ECT Signal circuit and the (K900) Sensor
ground circuit at the ECT harness connector.
Ignition on, engine not running.
With the DRBIII
t, read the ECT Sensor voltage.
Is the voltage below 1.0 volt?
All
Yes
→ Replace the ECT Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
NOTE: Remove the jumper wire before continuing.
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DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (K2) ECT Signal circuit at
the ECT Sensor harness connector.
Does the test light illuminate brightly?
All
Yes
→ Repair the short to voltage in the (K2) ECT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K2) ECT Signal circuit from the ECT Sensor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the open in the (K2) ECT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K900) Sensor ground circuit from the ECT Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (K900) Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0118-ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT HIGH —
Continued
Symptom:
P0122-THROTTLE POSITION SENSOR NO.1 LOW
When Monitored and Set Condition:
P0122-THROTTLE POSITION SENSOR NO.1 LOW
When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
Set Condition:
Throttle Position Sensor voltage at the PCM is less than 0.16 of a volt for
0.7 of a second. One Trip Fault.
POSSIBLE CAUSES
THROTTLE POSITION SENSOR SWEEP
INTERMITTENT CONDITION
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
THROTTLE POSITION SENSOR
(K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND
(K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
NOTE: Diagnose any IAC codes before continuing.
With the DRBIII
t, read the TP Sensor voltage.
Is the voltage below 0.2 of a volt?
All
Yes
→ Go To 2
No
→ Go To 9
2
Turn the ignition off.
Disconnect the TP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit at the TP Sensor harness
connector.
Is the voltage between 4.5 to 5.2 volts?
All
Yes
→ Go To 3
No
→ Go To 6
3
With the DRBIII
t, monitor the TP Sensor voltage with the Sensor harness connector
disconnected.
Is the voltage above 4.5 volts?
All
Yes
→ Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
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DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K22) TP Sensor No.1 Signal circuit
at the TP Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K22) TP Sensor No.1 Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
Measure the resistance between the (K22) TP Sensor No.1 Signal circuit and the
(K900) Sensor ground circuit at the TP Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short between the (K900) Sensor ground and the (K22)
TP Sensor No.1 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 8
6
Turn the ignition off.
Disconnect the C2 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (F855) 5-volt Supply circuit from the TP Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 7
No
→ Repair the open in the (F855) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
Measure the resistance between ground and the (F855) 5-volt Supply circuit at the
TP Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (F855) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 8
8
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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DRIVEABILITY - NGC
P0122-THROTTLE POSITION SENSOR NO.1 LOW —
Continued
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