Ford Electric Ranger 2001 Manual page 183

211-02-5
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: DTC C1778 POWER STEERING FAILURE
NOTE: Before proceeding, verify the power control station is not plugged
into the vehicle and the power steering fluid level is OK.
• With key ON, rotate the steering wheel and note the steering effort.
• Is the steering wheel difficult to turn?
A3 CHECK POWER STEERING FAULT STATUS
• With key ON, monitor the interface adapter assembly (IAA) module PID
VAPSFLT.
• Does the VAPSFLT PID indicate YES?
A4 CHECK CIRCUIT 3022 (R/Y) FOR OPEN
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key OFF, disconnect power steering assembly C1992 and measure
the resistance of the R/Y wire between pin 13 on the power steering
assembly C1992 and BOB pin 44.
• Is the resistance less than 5 ohms?
A5 CHECK CIRCUIT 3022 (R/Y) FOR SHORT TO GROUND
• With key OFF, measure the resistance between BOB pin 44 and ground
(BOB pin 80).
• Is the resistance greater than 10,000 ohms?
A6 CHECK AUXILIARY CONTACTOR RELAY STATUS
NOTE: The BOB must be connected to the IAA module and IAA module
C1945 to carry out this test step.
• With key OFF, reconnect power steering assembly C1992 (if
disconnected) and connect the 104-Pin Breakout Box (BOB) to the IAA
module and IAA module C1945.
• With key ON, monitor the interface adapter assembly (IAA) module PID
AUX HVC.
• Does the AUX HVC PID indicate CLOSED?
A7 CHECK POWER STEERING OPERATION
• Enter the IAA module active command mode AUXILIARY SYSTEM
CONTROL and set the active commands SUPPT SLI to YES and PWR
STEER to ON.
• Does the power steering pump operate?
A8 CHECK IAA MODULE POWER STEERING ENABLE SIGNAL
• Enter the IAA module active command mode AUXILIARY SYSTEM
CONTROL and set the active commands SUPPT SLI to YES and PWR
STEER to ON.
• With key ON, measure the voltage between BOB pin 99 and ground
(BOB pin 80).
• Is the voltage greater than 10 volts?
A9 CHECK CIRCUIT 3023 (BK/O) FOR SHORT TO POWER
• With key OFF, disconnect the IAA module from the BOB; leave BOB
connected to IAA module C1945.
• With key OFF, disconnect power steering assembly C1992.
• With key ON, measure the voltage between BOB pin 99 and ground
(BOB pin 80).
• Is the voltage greater than 0 volts?
(Continued)
Power Steering
TEST STEP ACTION TO TAKE
Yes = GO to A6.
GO to A3.
No =
GO to A4.
Yes =
No = VERIFY power steering
system for normal operation.
GO to A5.
No = REPAIR the R/Y wire.
Yes = GO to A6.
No = REPAIR the R/Y wire.
Yes = GO to A7.
No = CARRY OUT pinpoint test
for IAA DTC C1862
Contactor Circuit Failure.
REFER to Auxiliary
Contactor Relay Control in
Section 414-03A
Section 414-03B.
Yes = System OK. CHECK for
intermittent wiring
connections.
GO to A8.
No =
Yes = GO to A9.
GO to A10.
No =
Yes = REPAIR the BK/O wire.
No = REPLACE the IAA module.
REFER to Section 412-04.
2001 Ranger EV, 01/2001
211-02-5
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