Navistar International DT 466 Diagnostic/Troubleshooting Manual page 541

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
NOTE: Turn the ignition switch to OFF when disconnecting engine wiring harness connectors from
components.
See truck Chassis Electrical Circuit Diagram Manual for circuit numbers, connector and fuse locations.
Harness Resistance Checks – ECM to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
1
chassis connector 9260
Test Point Spec
1 to Pin A (9260) > 1 kΩ
2 to Pin A (9260) < 5 Ω
3 to Pin A (9260) >1 kΩ
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.
Harness Resistance Checks – ECM to Chassis Ground (Turn the ignition switch to OFF. Disconnect
1
chassis connector 9260
disconnected negative battery cable for ground test point.
Test Point Spec
1 to gnd cable > 1 kΩ
2 to gnd cable > 500 Ω
3 to gnd cable >1 kΩ
Harness Resistance Checks – VGT Actuator to 12-pin Connector (Turn the ignition switch to OFF.
Connect Turbo Breakout Harness to engine wiring harness only. Connect 12-pin Breakout Harness to
engine wiring harness only. Checks are from VGT actuator to 12-pin connector.)
1 to 10 < 5 Ω
2 to 4 < 5 Ω
Harness Resistance Checks – 12-pin Connector to ECM Chassis Ground (Turn the ignition switch to
OFF. Connect 12-pin Breakout Harness to chassis wiring harness only. Disconnect chassis connector
1
9260 .)
10 to Pin A (9260) > 1 kΩ
4 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.
Harness Resistance Checks – 12-Pin Connector to Chassis Ground (Turn the ignition switch to OFF.
Disconnect chassis connector 9260
use chassis side for test point. Use disconnected negative battery cable for ground test point.)
10 to gnd cable
> 1 kΩ
4 to gnd cable > 500 Ω
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
. Connect Turbo Breakout Harness to engine wiring harness only.
Comment
If < 1 kΩ, check for short to ground on actuator power within wiring harness.
If > 5 Ω, check for an open circuit.
If < 1 kΩ, check for short to ground on VGT actuator control within wiring
harness.
. Disconnect negative battery cable. Disconnect engine harness from actuator. Use
Comment
If < 1 kΩ, check for short to ground on actuator power.
If < 500 Ω, check for short to ground.
If < 1 kΩ, check for short to ground on VGT actuator control.
If > 5 Ω, check for open in actuator power.
If > 5 Ω, check for open in actuator ground.
If < 1 kΩ, check for short to ground on chassis wiring harness ground circuit.
If > 5 Ω, check for open circuit in chassis wiring harness ground circuit.
1
. Disconnect negative battery cable. Disconnect 12-pin connector and
If < 1 kΩ, check for short to ground.
If < 500 Ω, check for short to ground.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
EGES-270-1
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