358 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
X1–10 to gnd cable
>500Ω If < 500 Ω, check for short to ground.
Harness Resistance Check (Check with breakout box connected to engine harness only. Check from ECM
to sensor harness connector.)
X1–9 to 1
<5Ω If > 5 Ω, check for open circuit.
X1–10to2
<5Ω If > 5 Ω, check for open circuit.
1
Connector 9260 is a 2-wire connector usually l ocated in the batter
y box. P in A is th e 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 b
ox connected to ECM an d eng ine harness.)
Test Point
Engine Cranking
Low Idle High Idle
Comment
X1–9 to X1–6 130 rpm to 225
rpm
2
@130rpmto
225 rpm
700 rpm
2
@ 700
rpm
2950 rpm
2
@ 2950
rpm
Set DMM to
DCmV-rpm
2
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
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
To Next Page
Loading...
Need help?
General