Ford Electric Ranger 2001 Manual page 210

303-01-5
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: DTC C1284 OIL PRESSURE SWITCH FAILURE
• With key ON, measure the voltage between BOB pin B12 and ground
(BOB pin A29).
• Is the voltage greater than 0 volts?
A9 CHECK POWER TO OIL PUMP
• With key OFF, connect TIM to BOB; leave BOB connected to TIM
C4998 and C4999.
• With key OFF, disconnect oil pump C4992.
• Enter the TIM active command mode FLUID CONTROL and set the
active command PUMP to ON.
• Measure the voltage between pin 2 (P/LG wire) and pin 3 (BK wire) on
oil pump C4992.
• Is the voltage greater than 10 volts?
A10 CHECK GROUND TO OIL PUMP
• With key OFF, measure the resistance between the BK wire on oil pump
C4992 and ground.
• Is the resistance less than 5 ohms?
A11 CHECK OIL PUMP RELAY CONTROL CIRCUIT
• With key OFF, remove the oil pump relay from the relay box.
• Enter the active command mode FLUID CONTROL, set the active
command PUMP to ON, and measure the resistance between BOB pin
A37 and ground (BOB pin A29).
• Is the resistance less than 5 ohms?
A12 CHECK CIRCUITS 3004 (P/LG) AND 3005 (P/LG) FOR OPEN(S)
• With key OFF, disconnect the TIM from the BOB; leave BOB connected Yes =
to TIM C4998, C4999.
• With key OFF, measure the resistance of the P/LG wire between pin 2
on the oil pump relay connector and BOB pin A37.
• With key OFF, measure the resistance of the P/LG wire between pin 5
on the oil pump relay connector and pin 2 on oil pump C4992.
• Are the resistances less than 5 ohms?
A13 CHECK POWER TO OIL PUMP RELAY
• With key ON, measure the voltage between pins 1, 3 on the oil pump
relay connector and ground.
• Are the voltages greater than 10 volts?
PINPOINT TEST B: CHECK TRANSAXLE OIL PRESSURE
B1 CHECK TRANSAXLE OIL PRESSURE
• Remove the plug from the left rear bottom corner of the transaxle.
• Install an oil pressure gauge.
• Set parking brake and turn the key to start position and release.
• With the transaxle enabled, check the oil pressure.
• Does the oil pressure stay steady (within 3 psi) and above 15 psi for
30 minutes?
Basic Motor/Transaxle
TEST STEP
TEST STEP
ACTION TO TAKE
Yes = REPAIR the DB/W wire.
No = GO to A9.
Yes = System OK. CHECK wiring
for intermittent connections.
GO to A10.
No =
Yes = GO to A11.
No = REPAIR the BK wire.
GO to A12.
Yes =
No = REPLACE the TIM. REFER
to Section 303-14.
GO to A13.
No = REPAIR the P/LG wire(s) in
question.
Yes = REPLACE the oil pump
relay.
No = REPAIR the LB/O wire(s)
in question.
ACTION TO TAKE
Yes = The transaxle lubrication
system has an intermittent
fault.
• Oil pressure switch
• Oil switch circuit
• Oil pump relay
• Oil pump relay circuit
• TIM module
• Transaxle
No = Call the Electric Vehicle
Hotline 1-800-826-4694.
2001 Ranger EV, 01/2001
303-01-5