Cmp Pin-Point Diagnostics - Navistar International DT 466 Diagnostic/Troubleshooting Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

CMP Pin-Point Diagnostics

Figure 411 CMP circuit diagram
Sensor and Circuit Resistance Check (Check with breakout box connected [X1 only] to engine harness
only and CMP sensor connected. Disconnect chassis connector 9260
Test Point
X1–9 to X1–10
X1–9 to Pin A (9260)
Sensor Resistance Check (Disconnect harness from sensor. Note: Test point to sensor only.)
1 to 2
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
harness from sensor. Disconnect chassis connector 9260
X1–9 to Pin A (9260)
X1–10 to Pin A (9260) < 5 Ω
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
1
connector 9260 . Disconnect negative battery cable. Disconnect harness from sensor. Use disconnected
negative battery cable for ground test point.)
X1–9 to gnd cable
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Spec Comment
300 Ω to 400 Resistance through sensor and complete circuit. If not within spec,
Ω do Sensor Resistance Check. If in spec, check for short to ground
or open within wiring.
300 Ω to 400 Resistance through sensor and complete circuit. If not within spec,
Ω do Sensor Resistance Check. If in spec, check for short to ground
or open within wiring.
300 Ω to 400 If within spec, check for short to ground or open within wiring.
Ω
If not within spec, replace sensor.
> 500 Ω If < 500 Ω, check for short to ground within wiring harness.
If > 5 Ω, check for open circuit within wiring harness.
> 1 kΩ If < 1 kΩ, check for short to ground.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
1
. Inspect for bent pins or corrosion.)
1
.)
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