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

496 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

IPR Pin-Point Diagnostics

The IPR circuit requires the use of vehicle circuit diagrams. See truck Chassis Electrical Circuit Diagram
Manual for circuit numbers, connector and fuse locations.
IPR Voltage Checks (Disconnect regulator connector. Connect breakout harness to engine harness only.
Turn the ignition switch to ON.)
Test Point
Spec
A to gnd B+
B to gnd 0 V to 0.25 V
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Connect
breakout harness to engine harness only. Disconnect chassis connector 9260
1 to Pin A (9260) > 1 kΩ
2 to Pin A (9260) > 1 kΩ
Harness Resistance Checks - 12-pin Connector to IPR Connector (Turn the ignition switch to OFF.
Connect 12- pin breakout harness to engine harness only. Connect actuator breakout harness to engine
harness only. Check with fuse removed.)
Pin 9 to A < 5 Ω
Harness Resistance Checks - IPR Circuit Including Regulator (Turn the ignition switch to OFF. Connect
Breakout Box X1 to engine harness only. Connect engine harness to IPR. Check with fuse remove.)
X1-12 to fuse 5 Ω to 20 Ω
Actuator Resistance Checks (Turn the ignition switch to OFF. Disconnect the connector from the IPR,
connect breakout harness to IPR only. Check resistance through the IPR only.)
A to B 5 Ω to 20 Ω
IPR Diagnostic Trouble Codes
DTC 241 = Output Circuit Check detected during KOEO Standard Test, indicates high or low resistance in
circuit.
1
Connector 9260 is a 2-wire connector usually located in the battery box. Pin A is the ground connection for the ECM
and IDM. See truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM ground circuit
information.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Comment
IPR power from V – If no voltage, check from fuse to IPR connector.
IGN
See truck Chassis Electrical Circuit Diagram Manual for circuit
numbers, connector and fuse locations.
If > 0.25 V, control wire is shorted to V
Resistance to chassis ground. If < 1 kΩ, check for short to ground in
circuit (check with fuse removed)
If < 1 kΩ, check for short to ground
If > 5 Ω check for open circuit.
Resistance through entire IPR circuit including regulator. If not within
specification do Actuator Resistance Check.
Resistance through IPR coil only. If not within specification replace
IPR.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
or B+.
REF
1
.)