Navistar INTERNATIONAL DT 466 - CKP Pin-Point Diagnostics

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 353
CKP Pin-Point Diagnostics
Figure 408 CKP circuit diagram
Sensor an d Circuit Resistance Check (Check with breakout box connected [X1 only] to engine harness
only and CKP sensor connected. Disconnect chassis connector 9260
1
. Inspect for bent pins or corrosion.
Note: SetDMMto4kΩ range.)
Test Point
Spec Comment
X1–1 to X1–2
800 Ω to1kΩ Resistance through sensor and complete circuit. If not within spec,
do Sensor Resistance Check. If in spec, check for s hort to ground
or open within wiring.
X1–1 to Pin A (9260) 800 Ω to1kΩ Resistance through sensor and complete circuit. If not within spec,
do Sensor Resistance Check. If in spec, check for s hort to ground
or open within wiring.
Sensor Resistance Check (Di
sconnect harness from sensor. Note: Test point to sensor only.)
1to2
800 Ω to1kΩ If within spec, check for short to ground or open within wiring.
If not within spe c, replace sensor.
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
harness from sensor. Disconnect chassis connector 9260
1
.)
X1–1 to Pin A (9260) > 1 kΩ If < 1 kΩ, check for short
to ground within wiring harness.
X1–2 to Pin A (9260) < 5 kΩ If > 5 k Ω, check for open circuit within wiring harness.
WARNING: To avoid serious personal injury, possible death, or damage to the engine or vehicle,
always disconnect main negative battery cable first. Always connect the main negative battery cable
last.
Connector Resistance Checks to Chassis Ground (Turn the ignition switch to OFF. Disconnect chassis
connector 9260
1
. Disconnect negative battery cable. Disconnect harness from sensor. Use disconnected
negative battery cable for ground test point.)
X1–1 to gnd cable
>1kΩ If < 1 kΩ, check for short to ground.
X1–2 to gnd cable
>500Ω If < 500 Ω,checkf
or short to ground.
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.