Page 1081 of 5267
4.(G127) EOT SENSOR SIGNAL CIRCUIT SHORTED TO (Z1) GROUND CIRCUIT
Measure the resistance between the (G127) Engine Oil Temp Sensor
Signal circuit and the (Z1) ground circuit at the EOT Sensor harness
connector.
Istheresistancebelow100ohms?
Ye s>>
Repair the short between the (Z1) ground circuit and the
(G127) Engine Oil Temp Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 5
5.PCM
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.
Repair
Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
Page 1082 of 5267
P0198-ENGINE OIL TEMPERATURE SENSOR VOLTAGE TOO HIGH
For a complete wiring diagramRefer to Section 8W.
Page 1083 of 5267

When Monitored:
Ignition on.
Set Condition:
When the PCM recognizes the engine oil temperature sensor signal above a specific voltage.
Possible Causes
ENGINE OIL TEMP SENSOR
(G127) ENGINE OIL TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
(G127) ENGINE OIL TEMP SENSOR SIGNAL CIRCUIT OPEN
(Z1) GROUND CIRCUIT OPEN
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.ENGINE OIL TEMP VOLTAGE ABOVE 4.9 VOLTS
Ignition on, engine not running.
With the scan tool, read DTCs and record the related Freeze Frame data.
With the scan tool, read Engine Oil Temp Sensor voltage.
Is the voltage above 4.9 volts?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITIONSymptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.ENGINE OIL TEMP SENSOR
Turn the ignition off.
Disconnect the Engine Oil Temp Sensor harness connector.
Ignition on, engine not running.
Connect a jumper wire between the (G127) Engine Oil Temp Sensor
Signal circuit and the (Z1) ground circuit in the EOT harness connector.
With the scan tool, read the Engine Oil Temp Sensor voltage.
Is the voltage below 1.0 volt?
Ye s>>
Replace the Engine Oil Temp Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 3
NOTE: Remove the jumper wire before continuing.
Page 1084 of 5267

3.(G127) ENGINE OIL TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (G127) Engine Oil Temp Sensor Signal cir-
cuit at the EOT Sensor harness connector.
Is the voltage above 5.3 volts?
Ye s>>
Repair the short to voltage in the (G127) Engine Oil Temp
Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 4
4.(G127) ECT SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (G127) Engine Oil Temp Sensor Signal
circuit from the Sensor harness connector to the Engine Oil Tempera-
ture Guage.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 5
No>>
Repair the open in the (G127) Engine Oil Temp Sensor Sig-
nal circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
5.(Z1) GROUND CIRCUIT OPEN
Measure the resistance between a known good ground and the (Z1)
ground circuit at the Sensor harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 6
No>>
Repair the open in the (Z1) ground circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
Page 1085 of 5267
6.PCM
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.
Repair
Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
Page 1086 of 5267
P0201-FUEL INJECTOR 1 CIRCUIT
For a complete wiring diagramRefer to Section 8W.
Page 1087 of 5267

When Monitored:
With battery voltage greater than 10.4 volts, the auto shutdown relay energized, injector pulse width less than
10ms, and engine speed less than 3000 rpm.
Set Condition:
This trouble code takes .64 to 10.0 seconds to set when no inductive kick is sensed .18ms after injector turn
off, and with no other injectors on.
Possible Causes
(K342) ASD RELAY OUTPUT CIRCUIT
(K11) INJECTOR CONTROL NO.1 CIRCUIT OPEN
(K11) INJECTOR CONTROL NO.1 CIRCUIT SHORTED TO GROUND
FUEL INJECTOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.(K342) ASD RELAY OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the No.1 Fuel Injector harness connector.
Ignition on, engine not running.
With the scan tool, actuate the ASD Relay.
Using a 12-volt test light connected to ground, probe the (K342) ASD
Relay Output circuit in the Fuel Injector harness connector.
Does the test light illuminate brightly?
Ye s>>
Go To 3
No>>
Repair the excessive resistanceorshorttogroundinthe
(K342) ASD Relay Output circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
Page 1088 of 5267

3.FUEL INJECTOR
Using a 12-volt test light connected to 12-volts, probe the (K11) Injector
Control No.1 circuit.
With the scan tool, actuate the Fuel Injector.
What is the state of the test light during the actuation?
Brightly Blinking.
Replace the Fuel Injector.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
ON Constantly.
Go To 4
OFF Constantly.
Go To 5
4.(K11) INJECTOR CONTROL NO.1 CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K11) Injector Control
No.1 circuit in the Injector harness connector.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (K11) Injector Control No.1
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 6
5.(K11) INJECTOR CONTROL NO.1 CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM harness connector.
Measure the resistance of the (K11) Injector Control No.1 circuit from
the Fuel Injector harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 6
No>>
Repair the open in the (K11) Injector Control No.1 circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)