Test Procedure

NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION table of fault code setting condition.

FAULT CODE SETTING CONDITION

Fault Code	KOEO	KOER	Continuous Memory
P0127	DU7	DU7	DU7
P1114	DU5	DU5	DU5
P1115	DU1	DU1	DU1

DU1 DTC P1115: SIMULATE AN OPPOSITE SIGNAL TO THE PCM

The DTC indicates the sensor signal is greater than the self -test maximum.
Possible causes:
- Open in the harness.
- Incorrect harness connections.
- Faulty Sensor.
- Faulty or damaged PCM.
IAT2 connector disconnected.
NOTE: On some applications the IAT2 signal is integrated into the TMAP sensor.
Key ON Engine OFF.
Connect a 5 amp fused jumper wire between the following:

Point A IAT2 Connector, Harness Side	Point B IAT2 Connector, Harness Side
IAT2	SIGRTN

Does a scan tool communication concern exist?

Yes	No
KEY OFF. REMOVE the jumper. GO to DU4.	GO to DU2.

DU2 CHECK FOR OPEN IN THE HARNESS

Jumper installed.
Access the PCM -IAT2 V PID.

Is the voltage less than 0.2 V?

Yes	No
INSTALL a new IAT2.	KEY OFF. REMOVE the jumper. GO to DU3.

DU3 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS

PCM connector disconnected.
Measure the resistance between:

( + )IAT2 Connector, Harness Side	( - )PCM Connector, Harness Side
IAT2	IAT2
SIGRTN	SIGRTN

Are the resistances less than 5 ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	REPAIR open circuit.

DU4 CHECK THE SENSOR SIGNAL FOR A SHORT TO VREF

Key OFF.
PCM connector disconnected.
Measure the resistance between:

( + )PCM Connector, Harness Side	( - )PCM Connector, Harness Side
IAT2	VREF

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	REPAIR short circuit to VREF.

DU5 DTC P1114: SIMULATE AN OPPOSITE SIGNAL TO THE PCM

The DTC indicates the sensor signal is less than the self-test minimum.
Possible causes:
- Grounded circuit in the harness.
- Incorrect harness connections.
- Faulty Sensor.
- Faulty or damaged PCM.
IAT2 connector disconnected.
NOTE: On some applications the IAT2 signal is integrated into the TMAP sensor.
Key ON Engine OFF.
Access the PCM -IAT2 V PID.

Is the voltage greater than 4.2 V?

Yes	No
KEY OFF. INSTALL a new IAT2.	KEY OFF. GO to DU6.

DU6 CHECK THE SENSOR SIGNAL FOR A SHORT TO GROUND

PCM connector disconnected.
Measure the resistance between:

( + )PCM Connector, Harness Side	( - )PCM Connector, Harness Side
IAT2	SIGRTN

Measure the resistance between:

( + )PCM Connector, Harness Side	( - )12V vehicle battery
IAT2	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	REPAIR short circuit.

DU7 DTC P0127: IAT2 TOO HIGH. CHECK SUPERCHARGER INTERCOOLER PUMP OPERATION

Scan Tool Connected
Enter Output Test Mode. Refer to OUTPUT TEST MODE .
Command outputs ON

Does the supercharger intercooler pump run?

Yes	No
GO to DU8. KEY OFF.	Charge air cooler (CAC) pump GO to PINPOINT TEST KP step 8 .

DU8 CHECK THE INTERCOOLER SYSTEM

Check intercooler system for low fluid level, cracked, blocked or misrouted coolant lines, cracked or blocked heat exchanger.

Does the intercooler system check OK?

Yes	No
KEY OFF. GO to DU9.	REPAIR as necessary.

DU9 SIMULATE THE HIGH IAT2 SIGNAL TO THE PCM

Key ON Engine OFF.
Access the PCM -IAT2 V PID.
Observe the PID while disconnecting the IAT2 sensor.

Is the voltage greater than 4.2 V?

Yes	No
KEY OFF. GO to DU10.	INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .

DU10 SIMULATE THE LOW IAT2 SIGNAL TO THE PCM

IAT2 connector disconnected.
NOTE: On some applications the IAT2 signal is integrated into the TMAP sensor.
Connect a 5 amp fused jumper wire between the following:

Point A IAT2 Connector, Harness Side	Point B IAT2 Connector, Harness Side
IAT2	SIGRTN

Key ON Engine OFF.
Access the PCM -IAT2 V PID.

Is the voltage less than 0.2 V?

Yes	No
RECONNECT the sensor and GO to REFERENCE VALUES - CNG, FLEX-FUEL & GASOLINE . COMPARE the IAT2 PID to reference values under different road test conditions. If the sensor is not in range, replace the sensor.	INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .