TM 5-3805-294-23-1
FIELD MAINTENANCE
DTC 637.07 - CRANKSHAFT AND HIGH-PRESSURE FUEL PUMP POSITION SIGNALS OUT OF SYNC
INITIAL SETUP:
References (cont.)
Tools and Special Tools
Tool Kit, General Mechanic's: Automotive
Volume 3, WP 0345
(Volume 5, WP 0796, Table 2, Item 119)
Volume 3, WP 0362
Accessory Kit, MSD Electronic Equipment
Volume 3, WP 0369
(Volume 5, WP 0796, Table 2, Item 2)
Volume 3, WP 0405
Multimeter, Digital
Volume 3, WP 0410
(Volume 5, WP 0796, Table 2, Item 77)
Volume 3, WP 0435
Probe Set, Standard
Volume 4, WP 0508
(Volume 5, WP 0796, Table 2, Item 91)
Volume 4, WP 0510
Test Set, MSD Electronic Systems
Volume 4, WP 0511
(Volume 5, WP 0796, Table 2, Item 116)
Volume 5, WP 0800
Personnel Required
Equipment Condition
Construction Equipment Repairer 91L (2)
Machine safely parked and shut down
(TM 5-3805-294-10). (Volume 5, WP 0794)
Test Equipment Setup for MSD and Service
References
ADVISOR. (Volume 3, WP 0375)
TM 5-3805-294-10 (Volume 5, WP 0794)
Troubleshooting Sequence
DTC 636.08 or 637.08
DTC 636.10, 637.10, 636.02, or 637.02
DTC 637.07
When DTC is Displayed
The engine is running above 400 rpm and the error condition is active.
Related Information
The ECU detects that the high-pressure fuel pump position sensor signal is not correctly timed relative to the
crankshaft sensor signal.
This DTC may be caused by incorrect upper idler gear timing or by a damaged timing wheel.
Wiring problems, such as loose terminals or water in connectors, may also cause this DTC to be active intermittently.
Alarm Level
Warning.
Control Unit Response
Prolonged cranking time may be required to start the engine.
0060-1