Ford Electric Ranger 2001 Manual page 228

303-03-7
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST B: COOLANT PUMP DOES NOT OPERATE
• With key OFF, disconnect coolant pump C1998.
• Enter the IAA module active command mode CLIMATE SYSTEM
CONTROL, set the active command PUMP/VBC to ON, and measure
the voltage between the W/R wire and BK wire on coolant pump C1998.
• Is the voltage greater than 10 volts?
B4 CHECK GROUND TO COOLANT PUMP
• With key OFF, measure the resistance between the BK wire on coolant
pump C1998 and ground.
• Is the resistance less than 5 ohms?
B5 CHECK COOLANT PUMP RELAY CONTROL CIRCUIT
• With key OFF, remove the coolant pump relay from the EVPDB.
• Enter the IAA module active command mode CLIMATE SYSTEM
CONTROL, set the active command PUMP/VBC to ON, and measure
the resistance between pin 86 on the coolant pump relay connector and
ground.
• Is the resistance less than 5 ohms?
B6 CHECK CIRCUIT 3020 (LB) FOR OPEN
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key OFF, measure the resistance of the LB wire between pin 86 on
the coolant pump relay connector and BOB pin 19.
• Is the resistance less than 5 ohms?
B7 CHECK CIRCUIT 3229 (W/R) FOR OPEN
• With key OFF, measure the resistance of the W/R wire between coolant
pump C1998 and pin 30 on the coolant pump relay connector.
• Is the resistance less than 5 ohms?
PINPOINT TEST C: COOLANT PUMP RUNS WITH THE IGNITION KEY IN THE OFF POSITION
C1 CHECK CIRCUIT 3229 (W/R) FOR SHORT TO POWER
• Remove the coolant pump relay from the electric vehicle power
distribution box (EVPDB).
• Does the coolant pump stop running?
C2 CHECK COOLANT PUMP RELAY
• Measure the resistance between terminals 30 and 87 on the coolant pump Yes =
relay.
• Is the resistance less than 5 ohms?
C3 CHECK CIRCUIT 3020 (LB) FOR SHORT TO GROUND
• With key OFF, disconnect interface adapter assembly (IAA) module
C1945 and measure the resistance between pin 86 on the coolant pump
relay connector and ground.
• Is the resistance greater than 10,000 ohms?
PINPOINT TEST D: COOLING FAN DOES NOT OPERATE
D1 CHECK FUSE AND POWER TO FAN SPEED RELAYS
• Check 50A fuse 5 in the electric vehicle power distribution box
(EVPDB).
(Continued)
Engine Cooling
TEST STEP
TEST STEP
TEST STEP
ACTION TO TAKE
Yes = REPLACE the coolant
pump.
No = GO to B4.
GO to B5.
Yes =
No = REPAIR the BK wire.
Yes = GO to B7.
GO to B6.
No =
REPLACE the IAA module.
REFER to Section 412-04.
No = REPAIR the LB wire.
Yes = REPLACE the coolant pump
relay.
No = REPAIR the W/R wire.
ACTION TO TAKE
GO to C2.
Yes =
No = REPAIR the W/R wire.
REPLACE the coolant pump
relay.
GO to C3.
No =
Yes = REPLACE the IAA module.
REFER to Section 412-04.
No = REPAIR the LB wire.
ACTION TO TAKE
Yes = RECONNECT the fan speed
relays. GO to D2.
2001 Ranger EV, 01/2001
303-03-7