10.3
ERRATIC PERFORMANCE AND NO CODES
10.3 ERRATIC PERFORMANCE AND NO CODES
The following troubleshooting chart resolves erratic performance and no codes displayed. For
troubleshooting procedures, refer to the appropriate engine service manual.
10.3.1
Erratic Performance and No Codes
Check the following symptoms to determine possible fault, listed in Table 10-1.
Symptom
Possible Fault
Cannot get full power.
Plugged fuel filters. Hose not connected to Turbo Boost
Sensor. Verify injector calibration(s) are correct.
Cannot get full throttle.
Mis-calibrated Throttle Position Sensor.
Runs rough; misses and occasionally stalls.
Improper gapping of Timing Reference and Synchronous
Reference Sensor. Fuel leaks. Loose battery power,
ignition or ground wires Injector failure. Vehicle speed
sensor failure. Injector harness failure.
Engine idles high after warm-up or hangs.
Incorrect calibration of Throttle Position Sensor.
TPS linkage or pedal problem. VSG signal wire
shorted to voltage source.
Low road speed.
Determine road speed specifications for vehicle
manufacturer data. If road speed is less than specified
and all mechanical checks are correct, then cruise
control calibration is suspected.
Vehicle surges or bucks.
VSS may be supplying incorrect data to the ECM.
Table 10-1
Troubleshooting Erratic Performance and No Code
All information subject to change without notice.
10-18
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
