Dodge Caliber. Manual — part 722
5.
MAP SENSOR
Turn the ignition off.
Connect a vacuum gauge to a manifold vacuum source.
Start the engine.
Allow the engine to idle.
NOTE: If engine will not idle, maintain a constant RPM above idle.
With the scan tool, read the MAP Sensor vacuum value.
Is the scan tool reading within 1
(
of the vacuum gauge reading?
Yes
>> Go to 6
No
>> Replace the MAP Sensor.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
6.
O2 SENSOR VOLTAGE
Start the engine.
If necessary, allow the engine to reach normal operating temperature.
With a scan tool, monitor all O2 Sensor voltage readings.
Is the voltage switching between 2.5 and 3.4 volts for all O2 sensors?
Yes
>> Go to 7
No
>> Go to 9
7.
1/1 O2 SENSOR HEATER
Turn the ignition off.
NOTE: Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow
the O2 Sensor voltage to stabilize at 5.0 volts.
Ignition on, engine not running.
With a scan tool, actuate the 1/1 O2 Sensor heater.
With the scan tool, monitor 1/1 O2 Sensor voltage for at least 2 minutes.
Does the voltage stay above 4.5 volts?
Yes
>> Replace the 1/1 O2 Sensor.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 8
PM
ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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8.
ENGINE MECHANICAL PROBLEM
Turn the ignition off.
Check for any of the following conditions/mechanical problems.
AIR INDUCTION SYSTEM - must be free from leaks.
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector
Are there any engine mechanical problems?
Yes
>> Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 12
9.
O2 SENSOR
Turn the ignition off.
Disconnect the O2 Sensor harness connector for the sensor where the voltage was not switching between 2.5 and
3.4 volts.
Turn the ignition on.
With a scan tool, monitor the O2 Sensor voltage.
NOTE: The voltage should be approximately 5.0 volts with the connector disconnected.
Connect a jumper wire between the signal circuit and the return circuit in the O2 Sensor harness connector.
NOTE: The voltage should drop from 5.0 volts to 2.5 volts with the jumper wire in place.
Did the O2 Sensor voltage change as described above?
Yes
>> Replace the O2 Sensor.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 10
10.
O2 SENSOR SIGNAL CIRCUIT
With a scan tool, monitor the O2 Sensor voltage with the jumper wire removed.
NOTE: The scan tool will display all O2 Sensor voltage readings at approximately 5.0 volts when one O2
Sensor signal circuit is shorted to voltage.
NOTE: The scan tool will display one O2 Sensor voltage close to zero and the others will read lower than
normal when one O2 Sensor signal circuit contains excessive resistance.
Inspect the O2 Sensor connector and the PCM harness connector for damage or corrosion.
Check the O2 Sensor signal circuit for a short to ground, open circuit, short to voltage, or high resistance.
Were any problems found?
Yes
>> Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 11
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
PM
11.
O2 SENSOR RETURN CIRCUIT
Check the O2 Sensor return circuit for a short to ground, open circuit, short to voltage or high resistance.
Were any problems found?
Yes
>> Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 12
12.
POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to the components tested
in this procedure.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to the components tested in this procedure and wiggle test the wiring and con-
nectors.
Look for the data to change or for a DTC to set during the wiggle test.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace and program the PCM in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
PM
ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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P0196-ENGINE OIL TEMPERATURE SENSOR PERFORMANCE
For a complete wiring diagram Refer to Section 8W
9 - 178
ENGINE ELECTRICAL DIAGNOSTICS - GPEC
PM
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