IK1200146 - MaxxForce engine will not crank (crank inhibit)

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Countries:

CANADA, UNITED
STATES

Document
ID:

IK1200146

Availability:

ISIS, FleetISIS

Revision:

5

Major System:

ENGINES

Created:

9/20/2007

Current
Language:

English

Last
Modified:

10/16/2013

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Languages:

Français, Español,

Author:

Rob
Marvel

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8394
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Title: MaxxForce engine will not crank (crank inhibit)
Applies To: All MaxxForce Engines, Prior to March 18,2013

Engine Crank Inhibit (ECI) System

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IK1200146 - MaxxForce engine will not crank (crank inhibit)

Page 2 of 3

Voltage Checks at Relay
(Connect relay breakout harness between relay and relay socket. Turn the ignition switch to CRANK. Use DMM
to measure voltage.)
Test Points
Specification
Comments
If < B+, check power circuit to relay switch for OPEN or short to GND, or
30 to GND
B+
blown fuse.
If < B+, check power circuit to relay coil for OPEN or short to GND, blow
86 to GND
B+
fuse, or possible failed ignition switch.
If B+, check ECI control circuit for OPEN or failed thermal overcrank
85 to GND
0.06 V to 2 V
protection switch.
If 4 V to 5 V, check DDS circuit to ECM and do "Voltage Check at ECM".
If < B+, replace relay.
87 to GND
B+
If B+, check voltage at starter.
Voltage Check at ECM
(Connect breakout box between ECM and vehicle harness. Turn the ignition switch to ON. Use DMM to measure
voltage.)
Test Points
Specification
Comments
If < B+, check VIGN circuit for OPEN or short to GND, blown fuse, or
C-31 to GND
B+
possible failed ignition switch.
C-2 to GND
If voltage is present, check for OPEN ECM GND circuit. See "ECM
C-4 to GND
0V
PWR"
C-6 to GND
C-1 to GND
C-3 to GND
B+
If < B+, check for OPEN ECM PWR circuit. See "ECM PWR".
C-5 to GND
Place automatic transmission in park or neutral (manual transmission, depress clutch). Use DMM to measure voltage.
If < B+, check DDS for OPEN circuit.
C-65 to GND

B+

For automatic transmission, see transmission diagnostics.
>For manual transmission, check PWR circuit to clutch pedal or
blown fuse. A failed clutch pedal switch is possible.
If > 2 V, check ECM programming.



C-7 to GND

0.06 V to 2 V

Harness Resistance Check - ECM to Relay
(Turn ignition switch to OFF. Connect breakout box and relay harness. Leave ECM and relay disconnected. Use
DMM to measure resistance.)
Test Points
Specification
Comments
If > 5 ohm, check ECI control circuit for OPEN or possible failed thermal
85 to C-7
< 5 ohm
overcrank protection switch.
85 to GND
> 1k ohm
If < 1k ohm, check ECI control for short to GND.
If > 5 ohm, check ECI control for OPEN or possible failed thermal
87 to starter
< 5 ohm
overcrank protection switch.
87 to GND
> 1k ohm
If < 1k ohm, check circuit for short to GND.
Harness Resistance Check - Relay to Battery
(Disconnect battery GND and 9260 GND connector. Remove VIGN fuse. Use DMM to measure resistance.)
Test Points
Specification
Comments
86 to VIGN
< 5 ohm
If > 5 ohm, check circuit for OPEN.
86 to GND
> 1k ohm
If < 1k ohm, check for short to GND.
30 to B+
< 5 ohm
If > 5ohm, check circuit for OPEN or blown fuse.
battery post
30 to GND
> 1k ohm
If < 1k ohm, check for short to GND.
C-65 DDS

See vehicle electrical diagrams. Check for OPEN or short to GND. Possible failed clutch switch or

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IK1200146 - MaxxForce engine will not crank (crank inhibit)

circuit

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automatic transmission module circuit faults.

Operational Voltage Check
(Connect breakout box between ECM and vehicle harness. Turn ignition switch to ON. Use DMM to measure
voltage.)
Test Points
Specification
Comments
ECM Input - Clutch pedal not depressed or automatic transmission in
DDS
0V
gear. Cranking is disabled.
C-65 to GND
B+
ECM Input - Clutch pedal to the floor or automatic transmission in park
or neutral. Cranking is enabled.
ECI
B+
ECM Output - Cranking is disabled.
C-7 to GND
0V
ECM Output - Cranking is enabled.

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Copyright © 2013 Navistar, Inc.

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