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Retrieving Codes
FAULT CODE DEFINITION FOR MCU SYSTEMS (46 - 64)
Chapter 4 72
CODE FAULT CODE DEFINITION
46 All Engines: Thermactor Air System unable to bypass.
51 I-4: Low or Mid Temperature Switch is open when
engine is hot.
I-6: Low or Mid Temperature Vacuum Switch is open
when engine is hot.
V-6: Hi or Hi/Low Vacuum Switch is always open.
V-8: Hi or Hi/Low Vacuum Switch is always open.
52 I-4 (car): Idle Tracking Switch (ITS) - voltage does not
change from closed to open throttle.
I-4 (truck): Idle/Decel Vacuum Switch open constantly.
I-6: Wide Open Throttle Vacuum Switch is open
constantly.
53 I-4: Wide Open Throttle Vacuum Switch open constantly.
I-6: CROWD Vacuum Switch open constantly.
V-6: Dual Temperature Switch is open constantly.
V-8: Dual Temperature Switch is open constantly.
54 V-8: Mid Temperature Switch is open constantly.
55 V-8: Mid Vacuum Switch is open constantly.
56 I-6: Closed Throttle Vacuum Switch is open constantly.
61 V-8: Hi/Low Vacuum Switch is closed constantly.
62
NOTE:
"High Altitude" refers to vehicles computer
adjusted for operation at high elevations.
I-4 (car): Idle Tracking Switch is closed at idle.
I-4 (truck): Idle/Decel Vacuum Switch is closed constantly.
I-6: Wide Open Throttle Vacuum Switch is closed
constantly.
V-6 (All except High Altitude): Altitude circuit is open.
V-6 (High Altitude only): System OK.
V-8 (All except High Altitude): Altitude (ALT) circuit is
open.
V-8 (High Altitude only): System OK.
63 I-4: Wide Open Throttle Vacuum Switch is closed
constantly.
I-6: CROWD Vacuum Switch is closed constantly.
64
NOTE:
"High Altitude" refers to vehicles that are
computer adjusted for high elevation operation.
I-4: (All except High Altitude): Altitude circuit is open.
I-4: (High Altitude only): System OK.
V-6: Mid Vacuum Switch is closed constantly.
V-8: Mid Vacuum Switch is closed constantly.
4
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