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

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
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. See truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM ground
circuit information.

MAP Pin-Point Diagnostics

Connector Voltage Checks to Ground (Disconnect harness from sensor. Inspect for bent pins or corrosion.
Connect breakout harness to engine harness only. Turn the ignition switch to ON.)
Test Point
Spec
1 to gnd 0 V to 0.25 V
2 to gnd 5 V ± 0.5 V
3 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) < 5 Ω
2 to Pin A (9260) > 500 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.
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.)
1 to gnd cable > 500 Ω
2 to gnd cable
> 500 Ω
3 to gnd cable > 1 kΩ
Harness Resistance Checks (Connect breakout box to engine harness [X1 and X2 only] and breakout
harness to engine harness only.)
X1–6 to 1 < 5 Ω
X1–14 to 2 < 5 Ω
X2–3 to 3 < 5 Ω
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. 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
Signal ground (no voltage expected). If > 0.25 V, check ground circuit for
open or high resistance and check signal ground for short to V
If voltage is not to spec, V
B+, or open.
If > 0.25 V, signal circuit is shorted to V
If > 5 Ω, check for open circuit.
If < 500 Ω, check for short to ground within wiring harness.
If < 1 kΩ, check for short to ground within wiring harness.
If < 500 Ω, check for short to ground.
If < 500 Ω, check for short to ground.
If < 1 kΩ , check for short to ground.
If > 5 Ω, check for open ground wire.
If > 5 Ω, check for open V
If > 5 Ω, check for open signal wire.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
circuit is shorted to ground, shorted to
REF
or B+.
REF
1
.)
wire.
REF
505
or B+.
REF