Ford 2001 Ranger, Manual

Page: 227 / 1218

303-03-6 303-03-6 Engine Cooling
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: DTC C1774 COOLANT TEMPERATURE SENSOR OUT OF RANGE
TEST STEP ACTION TO TAKE
A3 CHECK CIRCUITS 3064 (BK/O) AND 3065 (LG/P) FOR OPEN(S)
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes = GO to A4.
module disconnected.
•
With key OFF, disconnect coolant temperature sensor C1966 and No = REPAIR the wire(s) in
measure the resistance of the BK/O wire between BOB pin 70 and question.
coolant temperature sensor C1966.
•
With key OFF, measure the resistance between BOB pin 95 and coolant
temperature sensor C1966.
•
Are the resistances less than 5 ohms?
A4 CHECK CIRCUITS 3064 (BK/O) AND 3065 (LG/P) FOR SHORT(S)
TO GROUND
•
With key OFF, measure the resistance between BOB pins 70, 95, and Yes = GO to A5.
ground (BOB pin 80).
•
Are the resistances greater than 10,000 ohms?
No = REPAIR the wire(s) in
question.
A5 CHECK COOLANT TEMPERATURE SENSOR
•
With key OFF, measure the resistance between the terminals of the Yes = REPLACE the IAA module.
coolant temperature sensor and compare the reading to the values below: REFER to Section 412-04.
Actual Temperature (Approximate) No = REPLACE the coolant
temperature sensor.
— 0
°
C (32
°
F) = 91,000-100,700 ohms
— 5
°
C (41
°
F) = 71,100-78,700 ohms
— 10
°
C (50
°
F) = 56,000-62,000 ohms
— 15
°
C (59
°
F) = 44,400-49,100 ohms
— 20
°
C (68
°
F) = 37,300-39,200 ohms
— 25
°
C (77
°
F) = 28,500-31,500 ohms
— 30
°
C (86
°
F) = 23,000-25,500 ohms
— 35
°
C (95
°
F) = 18,700-20,700 ohms
— 40
°
C (104
°
F) = 15,300-16,900 ohms
— 45
°
C (113
°
F) = 12,500-13,900 ohms
— 50
°
C (122
°
F) = 10,300-11,500 ohms
— 55
°
C (131
°
F) = 8,600-9,500 ohms
— 60
°
C (140
°
F) = 7,100-7,900 ohms
•
Is the resistance OK?
PINPOINT TEST B: COOLANT PUMP DOES NOT OPERATE
TEST STEP ACTION TO TAKE
B1 CHECK FUSE AND POWER TO COOLANT PUMP RELAY
•
Check 20A fuse 20 in the electric vehicle power distribution box Yes = RECONNECT the coolant
(EVPDB). pump relay. GO to B2.
•
With key OFF, remove the coolant pump relay from the EVPDB and No = REPAIR as necessary.
measure the voltage between pins 85, 87 on the coolant pump relay
connector and ground. (V > 10 volts)
•
Is everything OK?
B2 CHECK COOLANT PUMP
•
Enter the interface adapter assembly (IAA) module active command Yes = System OK. CHECK wiring
mode CLIMATE SYSTEM CONTROL and set the active command for intermittent connections.
PUMP/VBC to ON.
•
Does the coolant pump operate?
No = GO to B3.
B3 CHECK POWER TO COOLANT PUMP
(Continued)
2001 Ranger EV, 01/2001