Ford 2001 Ranger, Manual

Page: 397 / 1218

414-02-5 414-02-5 Auxiliary Battery Charging
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST C: DTC C1775 DC/DC CONVERTER FAILURE
TEST STEP ACTION TO TAKE
C1 CHECK DC/DC CONVERTER OPERATION
NOTE: Before proceeding, verify the power control station (PCS) is not
Yes = System OK. CHECK wiring
plugged into the vehicle and all accessories (radio, A/C, heater, etc.) are
for intermittent connections.
turned off. If the New Generation STAR (NGS) Tester indicates UNABLE
TO PERFORM TEST/FUNCTION and MODULE NOT RESPONDING
for the interface adapter assembly (IAA) module when attempting to
monitor the IAA module PID VBATIAA, measure the voltage of the
auxiliary battery. If the voltage is less than 11 volts, recharge the auxiliary
battery. Refer to General Procedures in this section.
•
With key OFF, monitor the IAA module PID VBATIAA.
•
While monitoring the IAA module PID VBATIAA, turn the ignition key No = GO to C2.
to the ON position.
•
Does the VBATIAA PID increase from approximately 12.5 volts to
approximately 13.7 volts?
C2 CHECK DC/DC CONVERTER OPERATION USING NGS ACTIVE
COMMAND
•
Enter the IAA module active command mode AUXILIARY SYSTEM Yes = System OK. CHECK wiring
CONTROL, monitor the IAA module PID VBATIAA, and set the active for intermittent connections.
command SUPPT SLI to YES.
•
Is the voltage indicated by the VBATIAA PID between 13.4 and 13.8
No = GO to C3.
volts?
C3 CHECK AUXILIARY CONTACTOR RELAY STATUS
•
With key ON, monitor the IAA module PID AUX HVC. Yes = GO to C4.
•
Does the AUX HVC PID indicate CLOSED?
No = CARRY OUT pinpoint test
for IAA DTC C1862
Contactor Circuit Failure.
REFER to Auxiliary
Contactor Relay Control in
Section 414-03A or
Section 414-03B .
C4 CHECK MEGA FUSE
•
With key OFF, measure the resistance of the 175A MEGA fuse attached Yes = GO to C6.
to the electric vehicle power distribution box (EVPDB).
•
Is the resistance less than 5 ohms?
No = REPLACE the MEGA fuse.
GO to C5.
C5 CHECK POSITIVE BATTERY CABLES FOR SHORT(S) TO
GROUND
•
With key OFF, disconnect the cables from the auxiliary battery, and Yes = REPLACE the DC/DC
measure the resistance between the positive and negative auxiliary battery converter.
cables.
•
With key OFF, disconnect the positive battery cable from the DC/DC No = REPLACE the positive
converter and measure the resistance between the positive cable on the cable(s) in question.
MEGA fuse stud and the negative auxiliary battery post.
•
Are the resistances greater than 10,000 ohms?
C6 CHECK IAA MODULE DC/DC CONVERTER ENABLE SIGNAL
•
Connect 104-Pin Breakout Box (BOB) to the IAA module and IAA Yes = GO to C7.
module C1945.
•
With key ON, measure the voltage between BOB pin 100 and ground No = GO to C8.
(BOB pin 80).
•
Is the voltage greater than 10 volts?
C7 CHECK CIRCUIT 3259 (Y/BK) FOR SHORT TO POWER
•
With key OFF, disconnect the IAA module from the BOB; leave the Yes = REPAIR the Y/BK wire.
BOB connected to IAA module C1945.
(Continued)
2001 Ranger EV, 01/2001