354 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Harness Resistance Check (Check with breakout box connected to engine harness on
ly. Check from ECM
to sensor harness connector.)
X1–1 to 2
<5Ω If > 5 Ω, check for open circuit.
X1–2 to 1
<5Ω If > 5 Ω, check for open circuit.
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 CKP Sensor (Check with breakout box connected to ECM and engine harness.)
Test Point
Engine Cranking
Low Idle High Idle
Comment
X1–1 to X1–6
130Hz-225Hz@
130–225 rpm
650–700 Hz @
700 rpm
2.80 kHZ - 3.00
kHz @ 2950 rpm
Set DMM to
DCmV-Hz
NOTE: If the tachometer or MasterDiagnostics® display no rpm signal, but both indicate CMP and CKP sensor
activity, check the engine static timing.
CKP Diagnostic Trouble Codes
DTC 146 = CKP signal inactive (CMP signal active and ICP increased)
DTC 147 = Incorrect CKP signal signature
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.
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