SPN 636/FMI 1
The diagnostic condition is typically CKP Sensor Signal Voltage Too Low.
Low Signal Voltage Check
Check low signal voltage as follows:
- If fault occurs only when cranking the engine (and engine will not start), check that the CKP and Camshaft Position (CMP) sensors are correctly wired to the MCM. See Figure
"Crankshaft Position Sensor Wiring"
Figure 1. Crankshaft Position Sensor Wiring
- If fault occurs at other times then when cranking the engine, check that the CKP Sensor position is correct (the sensor is seated in all the way).
- Check the flywheel position through the inspection window of the timing case using turning tool. Look for timing marks and damage.
- Check crankshaft axial play.
Verify repairs as follows:
- Turn ignition OFF.
- Reconnect any electrical connections that were disconnected to perform the diagnosis.
- Clear codes with DDDL 7.0 or latest version.
- Start and bring engine up to operating temperature (over 140°F/60°C).
- Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.
|EPA07 Series 60 DDEC VI Troubleshooting Guide - 6SE567|
|Generated on 10-13-2008|