Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 49)

46
Service Codes
Power (Code 17)
Power (Code 17)
Replace ECU.
Note: ECUs are not a typical
cause of problems. If an ECU is
replaced, the system should be
carefully rechecked to make
sure the problem has been fixed
and does not reoccur.
No
With ignition switched on but engine
not running, measure battery voltage
across battery terminals.
Is voltage
reading < 18
volts?
Base vehicle power
is out of range.
With vehicle running, measure battery
voltage across battery terminals.
Is voltage
reading > 32
volts.
Does
measured
voltage match battery
voltage reading obtained
in previous
step?
Inspect for failure in power circuit including
vehicle power panel and/or ground
connections. Repair or replace as indicated.
Reconnect ECU and
switch ignition on.
Does power
fault reoccur?
Service code is not active.
Reverify flowchart steps
and wait for fault to
reoccur.
Base vehicle power is
out of range.
Yes
No
Yes
No
Yes
No
Yes
A
Is it a chassis
mount ECU?
Yes
Switch off ignition.
Disconnect the ECU connector.
Check power circuit by
measuring voltage between:
ECU Harness Connector Pins
K1 and K2 (rectangular
connector)
Switch off ignition.
Disconnect the ECU connector.
Switch on ignition.
Check power circuit by measuring
voltage between:
ECU Harness Connector Pins
H and F (round connector)
or
K1 and K2 (rectangular connector)
No
Is battery
voltage present?
No
Yes
Switch on ignition.
Check power circuit by measuring
voltage between:
ECU Harness Connector Pins
C3 and K2 (rectangular connector)
Switch on ignition.
Check power circuit by measuring
voltage between:
ECU Harness Connector Pins
K1 and K2 (rectangular connector)
A A