Jeep Wrangler TJ. Manual — part 90
TEST
ACTION
APPLICABILITY
5
WARNING: MAKE SURE THE ENGINE COOLING SYSTEM IS COOL BE-
FORE REMOVING THE PRESSURE CAP OR ANY HOSE. SEVERE PER-
SONAL INJURY MAY RESULT FROM ESCAPING HOT COOLANT. THE
COOLING SYSTEM IS PRESSURIZED WHEN HOT.
With the DRBIII
t, read and record the ECT Sensor Temperature value.
Using the DRB Temperature Probe #CH7050, measure the engine coolant tempera-
ture.
Is the ECT Sensor value with -15°C (5°F) of the temperature probe reading?
All
Yes
→ Go To 6
No
→ Go To 7
6
Inspect the Temperature sensors for any physical damage.
Inspect the engine coolant. Make sure the coolant is at the proper level. Refer to the
Service Information COOLING.
Make sure the Temperature sensors are properly installed.
Make sure the CMP and CKP sensors are mounted properly. Check the connectors for
any signs of damage.
WARNING: 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.
Refer to any Technical Service Bulletins (TSBs) that may apply.
With the engine running at normal operating temperature, monitor the Temperature
sensor parameters while wiggling the wire harness. Look for parameter values to
change.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched,
partially broken wires and broken, bent, pushed out, or corroded terminals.
CAUTION: NEVER 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.
Inspect and clean all PCM, engine, and chassis grounds.
Were any problems found during the above inspections?
All
Yes
→ Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Test Complete.
7
NOTE: Visually inspect both the component and the PCM connectors. Look
for damage, partially broken wires and backed out or corroded terminals
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage of the Signal circuit in the appropriate Temperature Sensor
harness connector.
Is the voltage above 5.2 volts?
All
Yes
→ Repair the short to battery voltage in the Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 8
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P0128-THERMOSTAT RATIONALITY —
Continued
TEST
ACTION
APPLICABILITY
8
Connect a jumper wire across the Temperature Sensor harness connector.
With the DRBIII
t, read the Temperature voltage.
Does the voltage start at 5.0 volts and drop below 1.0 volt?
All
Yes
→ Replace the suspected Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 9
9
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 Sensor Signal circuit from the Temperature Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 10
No
→ Repair the open in the Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
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 appropriate
Temperature Sensor harness connector to the appropriate terminal of special tool
#8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 11
No
→ Repair the open in the (K900) Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
11
Measure the resistance between ground and the Sensor Signal circuit in the
Temperature Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 12
12
Measure the resistance between the Signal circuit and the (K900) Sensor ground
circuit at the Temperature Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short between the (K900) Sensor ground circuit and
the Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 13
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P0128-THERMOSTAT RATIONALITY —
Continued
TEST
ACTION
APPLICABILITY
13
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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P0128-THERMOSTAT RATIONALITY —
Continued
Symptom:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE
When Monitored and Set Condition:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE
When Monitored:
With the ignition key on. No Cam or Crank signal within 75 ms. Engine
speed less than 250 RPM.
Set Condition:
The PCM senses the voltage from the MAP sensor to be less than 2.2 volts
but above 0.04 of a volt for 300 milliseconds. One Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
MAP SENSOR
(K1) MAP SIGNAL CIRCUIT OPEN
(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
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 MAP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit at the MAP Sensor harness
connector.
Is the voltage between 4.5 to 5.2 volts?
All
Yes
→ Go To 3
No
→ Go To 6
88
DRIVEABILITY - NGC
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