Ford Electric Ranger 2001 Manual page 445

414-03A-42
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: DTC C1446 BRAKE SWITCH CIRCUIT FAILURE
A5 CHECK MASTER CYLINDER PRESSURE STATUS
• With key ON, monitor the TIM PID MC PRES while depressing the
brake pedal.
• Does the MC PRES PID increase from approximately 0.45 to 4.65
volts as the brake pedal is depressed?
A6 CHECK MASTER CYLINDER BRAKE PRESSURE SENSOR
GROUND REFERENCE CIRCUIT
• With key OFF, disconnect master cylinder brake pressure sensor C1940
and measure the resistance between the W/R wire on master cylinder
brake pressure sensor C1940 and ground.
• Is the resistance less than 5 ohms?
A7 CHECK CIRCUIT 3601 (W/R) 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 W/R wire between master
cylinder brake pressure sensor C1940 and BOB pin B21.
• Is the resistance less than 5 ohms?
A8 CHECK CIRCUIT 3600 (R/W) FOR SHORT TO POWER
• 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, disconnect master cylinder brake pressure sensor C1940.
• With key ON, measure the voltage between BOB pin B22 and ground
(BOB pin A29).
• Is the voltage greater than 0 volts?
PINPOINT TEST B: DTC C1849 MASTER CYLINDER PRESSURE OUT OF RANGE
B1 CHECK MASTER CYLINDER PRESSURE STATUS
• With key ON, monitor the traction inverter module (TIM) PID
MC PRES while depressing the brake pedal.
• Does the MC PRES PID voltage increase from approximately 0.45
to 4.65 volts as the brake pedal is depressed?
B2 CHECK CIRCUIT 3600 (R/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, disconnect master cylinder brake pressure sensor C1940
and measure the resistance of the R/W wire between master cylinder
brake pressure sensor C1940 and BOB pin B22.
• Is the resistance less than 5 ohms?
B3 CHECK CIRCUIT 3600 (R/W) FOR SHORT TO GROUND
(Continued)
High Voltage/Traction Battery
TEST STEP
TEST STEP
414-03A-42
ACTION TO TAKE
Yes = System OK. CHECK wiring
for intermittent connections.
No = If MC PRES decreases
from approximately 4.60 to
4.10 volts, GO to A6.
If MC PRES is greater
than 4.8 volts at all times,
GO to A8.
Yes = REPLACE the master
cylinder brake pressure
sensor.
No = GO to A7.
Yes = REPLACE the TIM. REFER
to Section 303-14.
No = REPAIR the W/R wire.
Yes = REPAIR the R/W wire.
No = REPLACE the TIM. REFER
to Section 303-14.
ACTION TO TAKE
Yes = System OK. CHECK wiring
for intermittent connections.
No = If MC PRES is between
0.8 and 0.15 volts at all
times, GO to B2.
If MC PRES is 0.0 volts at
all times, GO to B4.
GO to B3.
Yes =
No = REPAIR the R/W wire.
2001 Ranger EV, 01/2001