Navistar International DT 466 Diagnostic/Troubleshooting Manual page 362

358 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
X1–10 to gnd cable
Harness Resistance Check (Check with breakout box connected to engine harness only. Check from ECM
to sensor harness connector.)
X1–9 to 1
X1–10 to 2
1
Connector 9260 is a 2-wire connector usually located in the battery box. Pin A is the chassis ground connection for
the ECM and IDM. Refer to truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM
ground circuit information.
Operational Checks for CMP Sensor (Check with breakout box connected to ECM and engine harness.)
Test Point
X1–9 to X1–6
NOTE: If the tachometer or MasterDiagnostics® display no rpm signal, but both indicate CMP and CKP sensor
activity, check the engine static timing.
CMP Diagnostic Trouble Codes
DTC 143 = Incorrect CMP signal signature
DTC 145 = CMP signal inactive
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
> 500 Ω If < 500 Ω, check for short to ground.
< 5 Ω If > 5 Ω, check for open circuit.
< 5 Ω If > 5 Ω, check for open circuit.
Low Idle
Engine Cranking
130 rpm to 225 700 rpm
rpm @ 130 rpm to rpm
2
225 rpm
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
High Idle
@ 700 2950 rpm
2
rpm
EGES-270-1
Comment
@ 2950 Set DMM to
2
DCmV-rpm
2