Ford TRADER Workshop Manual page 369

G
AIR HEATER SYSTEM
9TGOG1-OS7
0 - - - '
o
9TGOG1·058
B TERMINAL
9TGOG1-OS9
A TERMINAL
CTERMINAL
9TGOG1.Q60
G-20
AIR HEATER
Inspection
1. Disconnect the air heater connector.
2. Measure the resistance between the terminals.
Resistance
Terminal
Resistance (0)
A-8
0.053-0.064
3. Remove the air heater, and check for contamination of the
heating element.
4. If necessary, wash with water.
Caution
• After washing with water, dry with compressed air.
AIR HEATER RELAY
Inspectio.n
Voltage inspection
1. Check the engine coolant temperature.
2. If the temperature is more than 20°C (68°F), cut the con-
nector of water thermosensor and connect a resistance
(6000) to the wiring harness.
3. Check the voltage of the relay B terminal with circuit tester.
Standard voltage: Approx. 12V
4. Be sure the voltage of the relay A terminal is appox.12V
for 7 seconds after engine switch is ON.
5. If not as specified, be sure the voltage of the relay C termi-
nal is appox.12V for 7 seconds after engine switch is ON.
6. If as specified, perform the resistance inspection as follows.
If not as specified, check the air heater control unit.
7. Connect the water thermosensor.
Resistance inspection
1 . Disconnect the negative battery terminal.
2. Remove the air heater relay.
3. Verify that there is continuity between the C (wiring color
is white) and 0 (wiring color is black) terminal.
4. Verify that there is continuity between A and B terminal,
when apply the battery voltage beween C and 0 terminal.
5. If not as specified, replace
th~
relay.