Ford Electric Ranger 2001 Manual page 186

211-02-8
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST B: MORE THAN USUAL STEERING EFFORT REQUIRED TO TURN STEERING WHEEL
(POWER STEERING PUMP SPEED DOES NOT INCREASE WHILE TURNING THE STEERING WHEEL)
• With key OFF, measure the resistance of the R wire between pin 2 on
steering wheel sensor C2990 and pin 7 on power steering assembly
C1992.
• With key OFF, measure the resistance of the BR wire between pin 3 on
steering wheel sensor C2990 and pin 6 on power steering assembly
C1992.
• Are the resistances less than 5 ohms?
B5 CHECK CIRCUITS 3227 (R) AND 3228 (BR) FOR SHORT(S) TO
GROUND
• With key OFF, measure the resistance between pin 6 (BR wire), pin 7 (R Yes =
wire) on power steering assembly C1992 and ground.
• Are the resistances greater than 10,000 ohms?
B6 CHECK CIRCUITS 3227 (R) AND 3228 (BR) FOR SHORT(S) TO
POWER
• With key ON, measure the voltage between pin 6 (BR wire), pin 7 (R
wire) on power steering assembly C1992 and ground.
• Are any of the voltages greater than 0 volts?
PINPOINT TEST C: STEERING EFFORT EASIER THAN NORMAL AT HIGH SPEEDS
C1 CHECK POWER STEERING PUMP OPERATION
NOTE: Carry out the following steps with the hood raised. The speed of
the power steering pump should increase when the active command is sent
by New Generation STAR (NGS) Tester.
• Enter the traction inverter module (TIM) active command mode
SPEEDOMETER CONTROL and set the active command SPDOMETER
to 20%.
• Does the power steering pump speed increase?
C2 CHECK VEHICLE SPEED SENSOR (VSS) SIGNALS
• With key OFF, disconnect power steering assembly C1992.
• With TIM active command SPDOMETER set at 20%, measure the
frequency between pin 15 (GY/BK wire) on power steering assembly
C1992 and ground.
• Is the frequency between 0 and 8,000 Hz?
PINPOINT TEST D: STEERING WHEEL SHUDDER
D1 CHECK POWER STEERING FLUID
• Check power steering fluid level.
• Is the power steering fluid level OK?
D2 VERIFY STEERING WHEEL SHUDDER
(Continued)
Power Steering
TEST STEP
TEST STEP
TEST STEP
ACTION TO TAKE
No = REPAIR the wire(s) in
question.
GO to B6.
No = REPAIR the wire(s) in
question.
Yes = REPAIR the wire(s) in
question.
No = REPLACE the steering
wheel sensor.
ACTION TO TAKE
Yes = CHECK the steering
alignment and steering gear.
REPAIR as necessary.
GO to C2.
No =
Yes = REPLACE the power
steering assembly.
No = REPAIR the GY/BK wire
between power steering
assembly C1992 and TIM
C4998.
ACTION TO TAKE
GO to B2.
Yes =
No = CHECK for hydraulic leaks.
REPAIR as necessary. FILL
power steering reservoir to
correct level.
2001 Ranger EV, 01/2001
211-02-8