Ford 2001 Ranger, Manual

Page: 399 / 1218

414-02-7 414-02-7 Auxiliary Battery Charging
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST C: DTC C1775 DC/DC CONVERTER FAILURE
TEST STEP ACTION TO TAKE
•
Measure the resistance between circuit 3117 (DB wire) and circuit 3118 Yes = GO to C14.
(W wire) on HVPDB DC/DC converter C1914F.
•
Is the resistance greater than 10,000 ohms?
No = REPLACE the HVPDB.
REFER to Section 414-03A
or Section 414-03B .
C14 CHECK SYSTEM
•
With key OFF, reconnect all component connectors that were Yes = REPLACE the DC/DC
disconnected. converter. REPLACE the
10A DC/DC fuse. REFER to
Section 414-03A or
Section 414-03B .
•
Reconnect the 12-volt auxiliary battery negative cable. No = System OK.
•
Key ON.
•
Does the 10A DC/DC high-voltage fuse fail again?
PINPOINT TEST D: AUXILIARY BATTERY WARNING INDICATOR ILLUMINATED (AUXILIARY BATTERY
TEMPERATURE SENSOR FAILURE)
TEST STEP ACTION TO TAKE
D1 CHECK DC/DC CONVERTER OPERATION
NOTE: Before proceeding, verify the power control station (PCS) is not
Yes = System OK. CARRY OUT
plugged into the vehicle and all accessories (radio, A/C, heater, etc.) are
instrument cluster diagnosis.
turned off.
REFER to Section 413-01 .
•
With key OFF, monitor the IAA module PID VBATIAA.
•
While monitoring the IAA module PID VBATIAA, turn the ignition key No = GO to D2.
to the ON position.
•
Does the VBATIAA PID increase to approximately 13.7 volts?
D2 CHECK DC/DC CONVERTER
•
With key OFF, disconnect auxiliary battery temperature sensor C1953. Yes = GO to D6.
•
With key ON, monitor IAA module PID VBATIAA. Voltage should be No = GO to D3.
between 12.8 and 13.0 volts.
•
Connect a jumper wire between the DG/P wire and Y/R wire on
auxiliary battery temperature sensor C1953. Voltage should be between
14.6 and 15.1 volts.
•
Does the voltage increase as indicated when auxiliary battery
temperature sensor C1953 is jumpered?
D3 CHECK CIRCUITS 3223 (Y/R) AND 3224 (DG/P) FOR OPEN(S)
•
With key OFF, disconnect DC/DC converter C1943 and measure the Yes = GO to D4.
resistance of the Y/R wire between auxiliary temperature sensor C1953
and pin 1 on DC/DC converter C1943.
•
With key OFF, measure the resistance of the DG/P wire between No = REPAIR the wire(s) in
auxiliary battery temperature sensor and pin 2 on DC/DC converter question.
C1943.
•
Are the resistances less than 5 ohms?
D4 CHECK CIRCUITS 3223 (Y/R) AND 3224 (DG/P) FOR SHORT(S)
TO GROUND
•
With key OFF, measure the resistance between Y/R wire, DG/P wire on Yes = GO to D5.
auxiliary temperature sensor C1953 and ground.
•
Are the resistances greater than 10,000 ohms?
No = REPAIR the wire(s) in
question.
D5 CHECK CIRCUITS 3223 (Y/R) AND 3224 (DG/P) FOR SHORT(S)
TO POWER
(Continued)
2001 Ranger EV, 01/2001