Ford 2001 Ranger, Manual

Page: 210 / 1218

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