63.3
TROUBLESHOOTING FLASH CODE 63
[b] If the voltage measurement is less than 3 volts, contact Detroit Diesel Technical
Service.
63.3.3
Check Component Connections
Perform the following steps to check component connections:
1. Turn the vehicle ignition switch to the OFF position.
2. Inspect the connections of the PWM wire associated with the flash code logged at both
harness connector and the item being driven.
[a] If the connectors are damaged or broken, repair or replace the damaged terminals.
Verify repairs. Refer to section 63.3.9.
[b] If the connectors are not damaged or broken, ensure the item is connected to the pulse
width modulation wire. If the item is not connected, repair or replace the connector.
Verify repairs. Refer to section 63.3.9.
[c] If the item is connected, measure the resistance. Refer to section 63.3.8.
[d] If this is an Optimized Idle vehicle, refer to section 63.3.4.
63.3.4
Check Installation of the Starter Harness Overlay Kit
Perform the following steps to check for proper installation of the starter harness overlay kit when
a Code 63 is logged and the engine does not start; see Figure 63-1.
1. Turn off ignition (Optimized Idle Applications).
2. Remove relay from relay block.
3. Measure voltage between terminal 85 on the relay block and a good ground.
[a] If voltage measurement is less than 4 VDC, the power lead to the relay is open.
Verify connection of wire #439 from the starter relay harness overlay to DDEC
wire #439 in the cab.
[b] If voltage measurement is more than 4 VDC, measure voltage between terminal
86 on the relay block and a good ground. If voltage is less than 4 VDC, the
resistor built into the harness is defective. Replace the harness and verify repairs.
Refer to section 63.3.5.
[c] If voltage measurement is more than 4 VDC, measure voltage between terminal 86
on the relay block and a good ground. If voltage is more than 4 VDC, the circuit
All information subject to change without notice.
63-6
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
