Checking choke cover-stepped heater



07.2—145 Checking choke cover-stepped heater

A. ©1976

Test conditions:	All fuses in order, engine at operating temperature, run engine at idle.

Wiring diagram (drawn with ignition switched off below 17 °C engine oil temperature)

Choke cover-stepped heater, automatic choke, positive and negative venting of float chamber



5 Relay box 7 Temperature switch 17 °C 12 Switchover valve EGR (brown) 32 Temperature switch 65 °C		33 Switchover valve air injection (blue) 37 Switchover valve float chamber positive ventilation (green) 46 Resistor 8 ohms		48 Choke cover 59 Starter lockout and back-up lamp switch 241 Switchover valve automatic choke (white)

Color code

bl = blue br = brown ge = yellow	rs = pink rt = red sw= black	vi = purple ws= white	a Fuse no. 4 b Coupler to main conductor Cable color purple — starter terminal 50 Cable color purple/white — starter switch terminal 50 c Warning switch catalyst temperature

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Test conditions:

All fuses in order, engine at operating temperature, run engine at idle.

Wiring diagram (drawn with ignition switched off, below 17 °C engine oil temperature)

Choke cover-stepped heater, EGR

Color code

bl = blue br = brown ge = yellow

rs = pink rt = red sw= black

vi = purple ws= white

a Fuse no. 3 (15/54)

b Relay starter terminal 85

c Relay starter terminal 86

7 Temperature switch 17 °C

12 Switchover valve EGR (brown)

46 Pre-resistor 8 ohms

47 Relay pre-resistor choke cover

48 Choke cover

49 Starter lockout and back-up light switch


Testing choke cover-stepped heater Connect voltmeter to output of resistor (46) and to ground. Disconnect plug connection of electric line to temperature switch 17 °C (7) and connect to ground.
Voltmeter indicating 7-8 volts.		Voltmeter not indicating 7—8 volts.
			W
	Test relay pre-resistor choke cover (47) Connect voltmeter one after the other to both connections of pre-resistor choke cover (46) and to ground.

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	C. ©1973/74

	Test conditions:	All fuses in order, engine at operating temperature, run engine at idle.

	Wiring diagram (drawn with ignition switched off, below 17 °C engine oil temperature)

	Choke cover-stepped heater, throttle valve lift



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D. @> 1974 California

Test conditions:	All fuses in order, engine at operating temperature, run engine at idle.

Wiring diagram (drawn with ignition switched off, below 17 °C engine oil temperature)

Choke cover-stepped heater, fuel evaporation control system



3 Temperature switch 62 °C 7 Temperature switch 17 °C 8 Temperature switch 100 °C 9 Switchover valve ignition 12 Switchover valve EGR 13 Vacuum switch		21 Switchbox 25 Relay disconnection temperature switch 62 °C/100 °C 26 Relay auxiliary fan 27 Auxiliary fan 32 Temperature switch 65 °C		33 Switchover valve air injection 37 Switchover valve fuel evaporation control system 46 Resistor choke cover 47 Relay resistor choke cover 48 Choke cover

Color code

bl = blue br = brown ge = yellow	gn = green rs = pink rt = red	sw = black vi = purple ws = white	a To two-point cable connector terminal 7 (TD) b Switch air conditioning system c Fuse no. 3 (15/54) d Fuse no. 4 (15/54) e Auxiliary fuse box for auxiliary fan f 4-point plug on relay holder g 2-point coupler, tied-up

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	E. ©1975/76

	Test conditions:	All fuses in order, engine at operating temperature, run engine at idle.

	Wiring diagram (drawn with ignition switched off, below 17 °C engine oil temperature)

	Choke cover-stepped heater, automatic choke, tank breather



	07.2.2 la-145/9