Ford Electric Ranger 2001 Manual page 209

303-01-4
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: DTC C1284 OIL PRESSURE SWITCH FAILURE
A1 CHECK FUSE
• Check 20A fuse 19 in the electric vehicle power distribution box
(EVPDB).
• Is the fuse OK?
A2 CHECK TRANSAXLE FLUID LEVEL
• Check the transaxle fluid level. Refer to
this section.
• Is the fluid level OK?
A3 CHECK OIL PUMP CURRENT
• With key OFF, disconnect oil pump C4992 and oil pressure switch
C4997.
• Connect Electric Motor/Transaxle Test Box to the oil pump, oil pressure
switch and cigar lighter socket.
• Set the oil pump power switch on Electric Motor/Transaxle Test Box to
the ON position.
NOTE: Set the multimeter to voltage measurement. The Electric
Motor/Transaxle Test Box measures current that is proportional to the
voltage.
• Connect a multimeter to the oil pump current ports on Electric
Motor/Transaxle Test Box and measure the voltage.
• Is the voltage between 2.5 and 6.5 volts?
•
A4 CHECK OIL PRESSURE SWITCH
• Observe the oil pump pressure LED on Electric Motor/Transaxle test
box.
• Is the oil pump pressure LED on?
A5 CHECK OIL PRESSURE SWITCH STATUS
• Disconnect Electric Motor/Transaxle Test Box from the motor/transaxle
and reconnect oil pump C4992 and oil pressure switch C4997.
• With key ON, monitor the traction inverter module (TIM) PID OILPSWI
while turning the ignition key to the START position.
• Wait approximately 10 seconds.
• Does the OILPSWI PID indicate ACTIVE?
A6 CHECK GROUND TO OIL PRESSURE SWITCH
• With key OFF, disconnect oil pressure switch C4997 and measure the
resistance between the BK wire on oil pressure switch C4997 and
ground.
• Is the resistance less than 5 ohms?
A7 CHECK CIRCUIT 3605 (DB/W) FOR OPEN
• Connect 104-Pin Breakout Box (BOB) to TIM C4998, C4999 using the
BCM/TIM BOB Adapter Cable and Overlay; leave the TIM
disconnected.
• With key OFF, measure the resistance of the DB/W wire between BOB
pin B12 and ground (BOB pin A29).
• Is the resistance less than 5 ohms?
A8 CHECK CIRCUIT 3605 (DB/W) FOR SHORT TO POWER
(Continued)
Basic Motor/Transaxle
TEST STEP
Oil Level Check Procedure
ACTION TO TAKE
GO to A2.
Yes =
No = REPLACE the fuse.
GO to A3.
in Yes =
No = FILL the motor/transaxle to
the appropriate fluid level.
REFER to
Procedure
GO to A4.
Yes =
No = REPLACE the
motor/transaxle.
Yes = GO to A5.
No = REPLACE the oil pressure
switch.
Yes = System OK. CHECK wiring
for intermittent connections.
GO to A6.
No =
GO to A7.
Yes =
No = REPAIR the BK wire.
Yes = GO to A8.
No = REPAIR the DB/W wire.
2001 Ranger EV, 01/2001
303-01-4
Oil Level Check
in this section