DD15 SPN 558/FMI 4 Troubleshooting

SPN 558/FMI 4

This diagnostic condition is typically either a short to ground or an open wire.‪

Check as follows:‪

1. Disconnect the Idle Validation Switch.
2. Disconnect the CPC #1 connector.
3. Measure the resistance between pin 4 of the Idle Validation Switch connector and ground.
   1. If the resistance is less than 5 Ω, repair the short to ground between pin 6 of the CPC #1 connector and pin 4 of the Idle Validation Switch connector. Refer to “43.3.1 Verify Repairs” .
   2. If the resistance is greater than 5 Ω, go to the next step.
4. Measure the resistance between pin 5 of the Idle Validation Switch connector and ground.
   1. If the resistance is less than 5 Ω, repair the short to ground between pin 3 of the CPC #1 connector and pin 5 of the Idle Validation Switch connector. Refer to “43.3.1 Verify Repairs” .
   2. If the resistance is greater than 5 Ω, replace the Idle Validation Switch. Refer to “43.3.1 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.