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67 FLASH CODE 67 - MAP SENSOR FAULT
Section Page
67.1 DESCRIPTION OF FLASH CODE 67 ..................................................... 67-3
For diesel engines, Flash Code 67 indicates that the coolant pressure input voltage to the ECM hasexceeded or dropped below the allowed range.
This code is not covered in this manual (for diesel engines). If changes occur, notification willbe sent from DDC.
For gas engines, Flash Code 67 indicates that the input voltage to the ECM from the air inletpressure sensor has dropped below 5%, or gone above 95% of the sensor supply voltage.
67.2 SAE J1587 EQUIVALENT CODE FOR FLASH CODE 67
For diesel engines, the SAE J1587 equivalent codes for Flash Code 67 are 109/3, coolant pressuresensor input voltage high, and 109/4, coolant pressure sensor input voltage low.
For gas engines, the SAE J1587 equivalent codes for Flash Code 67 are p 106/3, air inlet pressuresensor input voltage high, and p 106/4, air inlet pressure sensor input voltage low. Inlet pressureis also referred to as Manifold Air Pressure (MAP).
All information subject to change without notice. (Rev. 2/03)
Perform the following steps to check the MAP sensor connectors.
1. Check terminals at the MAP sensor connector (both sensor and harness side) for damage:bent, corroded, and unseated pins or sockets. See Figure 67-4.
[a] If the terminals and connectors are damaged, repair them. Refer to section 67.4.7.
All information subject to change without notice. (Rev. 2/03)
[b] If the terminals and connectors are not damaged, replace the MAP sensor.Refer to section 67.4.7.
Figure 67-4 Manifold Air Pressure Sensor
67.4.4 Check for Short to +5 Volt Line
Perform the following steps to check for a short to the +5 volt line:
1. Turn vehicle ignition OFF.
2. Disconnect engine harness connector from the ECM.
3. Measure resistance between sockets P1 and W1 on the engine harness connector.See Figure 67-5.
[a] If measured resistance is less than or equal to 10,000 , the signal line #432 isshorted to the engine +5 volt line #416. Repair short. Refer to section 67.4.7.
(Rev. 2/03) All information subject to change without notice.
[b] If measured resistance is greater than 10,000 , or open, refer to section 67.4.5.
Figure 67-5 ECM Engine Harness Connector
67.4.5 Check for Short to Battery
Perform the following steps to check for a short to the battery (+):
1. Remove both fuses to the ECM.
2. Disconnect the vehicle harness and 5-way power connector harness at the ECM.See Figure 67-6.
3. Measure resistance between sockets P1 of the engine harness connector and B3 on thevehicle harness connector.
4. Measure resistance between socket P1 on the engine harness connector and the 5-waypower harness connector sockets A and C.
[a] If the resistance measurement is less than or equal to 100 , a short exists betweensockets where the measurement was taken. Repair short and reinsert fuses, or resetbreakers. Refer to section 67.4.7.
All information subject to change without notice. (Rev. 2/03)
[b] If the resistance measurement is greater than 5 , or open, the signal line (#432) isopen; repair the open. Refer to section 67.5.10.
Figure 67-8 Manifold Air Pressure Sensor
67.5.5 Check for Short
Perform the following steps to check for short.
1. Remove jumper.
2. Measure resistance between pins A and C on the MAP sensor harness connector.
[a] If measured resistance between pins A and C is greater than 100 , or open, goto step 3
[b] If measured resistance between pins A and C is less than 100 , the signal line (#432)is shorted to the return line (#452). Repair the short. Refer to section 67.5.10.
3. Also measure resistance between socket C and a good ground.
[a] If measured resistance between socket C and a good ground is greater than 100 , oropen, refer to section 67.5.6.
[b] If measured resistance between socket C and a good ground is less than 100, the signal line (#432) is shorted to the battery ground. Repair the short and
refer to section 67.5.10.
(Rev. 2/03) All information subject to change without notice.
[b] If the resistance measurement is greater than 5 , or open, the vehicle +5 volt line(#416) is open. Repair open. Refer to section 67.5.10.
Figure 67-10 5-Way ECM Power Connector
67.5.8 Check for Short
Perform the following steps to check for short.
1. Remove jumper.
2. Measure resistance between pins A and B on the MAP sensor harness connector.See Figure 67-11.
[a] If measured resistance between pins A and B is greater than 100 , or open, goto step 3
[b] If measured resistance between pins A and B is less than 100 , the 5 volt supply(#416) is shorted to the return line (#452). Repair the short. Refer to section 67.5.10.
3. Also measure resistance between socket B and a good ground.
[a] If measured resistance between socket B and a good ground is greater than 100 , oropen, refer to section 67.5.6.
(Rev. 2/03) All information subject to change without notice.
[b] If measured resistance between socket B and a good ground is less than 100 ,the 5 volt supply (#416) is shorted to the battery ground. Repair the short andrefer to section 67.5.10.
Figure 67-11 Manifold Air Pressure Sensor
67.5.9 Check for Short to Battery +
Perform the following steps to check for short to battery +.
1. Turn vehicle ignition OFF.
2. Remove both fuses to the ECM.
3. Disconnect the engine harness, vehicle harness, and 5-way power connectors at the ECM.
4. Measure resistance between socket W1 on the engine harness connector and socket B3 ofthe vehicle harness connector, and between W1 and the 5-way power harness sockets Aand C. See Figure 67-12.
[a] If measured resistance is less than or equal to 100 , a short exists betweensockets where less than 100 was measured. Repair short and reinsert fuses.Refer to section 67.5.10.
All information subject to change without notice. (Rev. 2/03)
[b] If the resistance measurement is greater than 100 , or open, refer to section 67.5.6.
Figure 67-12 ECM Vehicle Harness Connector
67.5.10 Verify Repairs
Perform the following steps to verify repairs.
1. Turn vehicle ignition OFF.
2. Reconnect all connectors.
3. Turn ignition ON.
4. Clear codes.
5. Start and run the engine for one minute.
6. Stop engine.
7. Check DDR for codes.
[a] If no codes are logged, no further troubleshooting is required.
[b] If code 106/4 and any other codes are logged, all system diagnostics are complete.Please review this section from the first step to find the error. Refer to section 67.5.1.
[c] If code 106/4 is not logged and any other codes are logged, refer to section 9.1.
(Rev. 2/03) All information subject to change without notice.