DD15 SPN 636/FMI 8 Troubleshooting

SPN 636/FMI 8

The diagnostic condition is typically CKP Sensor Time Out.‪

Note: If the sensor is removed, be sure to check the sensor tip for metal debris and clutch material and clean it if necessary.

Check as follows:‪

1. Disconnect the MCM 120–pin connector.
2. Measure the resistance between pins 42 and 43 of the MCM 120–pin connector.
   1. If the resistance is less than 140 Ω, go to step 3 .
   2. If the resistance is greater than 140 Ω, go to step 5 .
3. Disconnect the CKP Sensor and clean the sensor tip.
4. Measure the resistance between pins 42 and 43 of the MCM 120–pin connector.
   1. If the resistance is less than 3 Ω, repair the short between pins 42 and 43 of the MCM 120–pin connector and the CKP Sensor. Refer to “56.5.1 Verify Repairs” .
   2. If the resistance is greater than 3 Ω, replace the CKP Sensor. Refer to “56.5.1 Verify Repairs” .
5. Disconnect the CKP Sensor.
6. Jumper pins 1 and 2 of the CKP Sensor harness.
7. Measure the resistance between pins 42 and 43 of the MCM 120–pin connector.
   1. If the resistance is greater than 3 Ω, repair the open between pins 42 and 43 of the MCM 120–pin connector and the CKP Sensor connector. Refer to “56.5.1 Verify Repairs” .
   2. If the resistance is less than 3 Ω, replace the CKP Sensor. Refer to “56.5.1 Verify Repairs” .

Verify Repairs

Verify repairs as follows:‪

1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
   

   ENGINE EXHAUST ‪
   To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes.