Test Procedure

DM1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Are DTCs P0106, P0107, P0108, or P0109 present?

Yes	No
GO to DM2.	For symptoms without DTCs, GO to DM2. For all others, RETURN to SYMPTOM CHARTS for further direction.

DM2 MONITOR THE MAP PID

Ignition ON, engine OFF.
Access the PCM and monitor the MAP_V (VOLT) PID.

Is the voltage between 0.5 - 4.95 V?

Yes	No
For DTC P0106. GO to DM9. For all others, GO to DM8.	GO to DM3.

DM3 CHECK THE VOLTAGE BETWEEN THE VREF AND SIGRTN CIRCUITS

MAP Sensor connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) MAP Sensor Connector, Harness Side	(-) MAP Sensor Connector, Harness Side
VREF - Pin 2	SIGRTN - Pin 4

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to DM4.	GO to PINPOINT TEST C .

DM4 CHECK FOR AN OPEN CIRCUIT

PCM connector disconnected.

Measure the resistance between:

(+) MAP Sensor Connector, Harness Side	(-) PCM Connector, Harness Side
MAP - Pin 1	MAP - Pin E18
SIGRTN - Pin 4	SIGRTN - Pin E6

Are the resistances less than 5 ohms?

Yes	No
GO to DM5.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

DM5 CHECK FOR A SHORT TO GROUND

Measure the resistance between:

(+) MAP Sensor Connector, Harness Side	(-) MAP Sensor Connector, Harness Side
MAP - Pin 1	SIGRTN - Pin 4

Measure the resistance between:

(+) MAP Sensor Connector, Harness Side	(-)
MAP - Pin 1	Ground

Are the resistances greater than 10K ohms?

Yes	No
GO to DM6.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

DM6 CHECK FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) MAP Sensor Connector, Harness Side	(-)
MAP - Pin 1	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to DM7.

DM7 INDUCE THE OPPOSITE MAP VOLTAGE

PCM connector connected.

Connect a 5 amp fused jumper wire between the following:

Point A MAP Sensor Connector, Harness Side	Point B MAP Sensor Connector, Harness Side
MAP - Pin 1	SIGRTN - Pin 4

Ignition ON, engine OFF.
Access the PCM and monitor the MAP_V (VOLT) PID.
Ignition ON, engine OFF.

Is the voltage less than 4.6 V?

Yes	No
INSTALL a new MAP sensor. Refer to the Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test.	GO to DM10.

DM8 CHECK FOR AN INTERMITTENT CONCERN

Ignition ON, engine OFF.
Access the PCM and monitor the MAP_V (VOLT) PID.
Carefully wiggle all accessible wiring and connectors associated with the circuit and look for a change in the PID state.
Wiggle the harness connector to simulate road shock.

Does a sudden change in voltage occur while monitoring the PID?

Yes	No
REPAIR as necessary or INSTALL a new MAP sensor. Refer to the Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test.	Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .

DM9 MAP RANGE OR PERFORMANCE

NOTE: If MAP DTCs P0107 or P0108 are present, diagnose those DTCs first.

If any mass air flow (MAF) sensor related DTCs are present, diagnose those DTCs prior to diagnosing MAP DTC P0106.

Ignition ON, engine OFF.
Access the PCM and monitor the MAP_V (VOLT) PID.
Record the KOEO MAP PID voltage.
Ignition ON, engine running.
Record the KOER MAP PID voltage.

Does the PID value change?

Yes	No
Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new MAP sensor. REFER to the Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test.

DM10 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.