Toyota Tundra Service Manual: Inspection

INSPECTION

PROCEDURE

1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

(a) Inspect the light control switch.

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
20 (H) - 12 (EL)	Light control switch off or DRL OFF	10 kΩ or higher
18 (T) - 12 (EL)
19 (A) - 12 (EL)
18 (T) - 12 (EL)	Light control switch tail	Below 1 Ω
18 (T) - 12 (EL)	Light control switch head	Below 1 Ω
20 (H) - 12 (EL)	Light control switch head	Below 1 Ω
19 (A) - 12 (EL)	Light control switch auto	Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a	Component without harness connected (Headlight Dimmer Switch Assembly)

(b) Inspect the headlight dimmer switch.

(1) Measure the resistance according to the value(s) in the table below.

HINT:

Perform the flash, high beam and low beam inspections with the light control switch on head.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
11 (HU) - 12 (EL)	Headlight dimmer switch flash	Below 1 Ω
17 (HF) - 12 (EL)	Headlight dimmer switch flash	Below 1 Ω
11 (HU) - 12 (EL)	Headlight dimmer switch hi beam	Below 1 Ω
16 (HL) - 12 (EL)	Headlight dimmer switch low beam	Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a	Component without harness connected (Headlight Dimmer Switch Assembly)

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
13 (TR) - 12 (EL) 15 (TL) - 12 (EL) 14 (CR) - 12 (EL)	Turn signal switch neutral	10 kΩ or higher
13 (TR) - 12 (EL)	Turn signal switch right turn	Below 1 Ω
13 (TR) - 12 (EL) 11 (TL) - 14 (CR) 14 (CR) - 12 (EL)	Turn signal switch right lane change	Below 1 Ω
15 (TL) - 12 (E)	Turn signal switch left turn	Below 1 Ω
15 (TL) - 12 (EL) 15 (TL) - 14 (CR) 14 (CR) - 12 (EL)	Turn signal switch left lane change	Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a	Component without harness connected (Headlight Dimmer Switch Assembly)

(d) Inspect the front fog light switch.

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
3 (LFG) - 4 (BFG)	Front fog light switch off	10 kΩ or higher
3 (LFG) - 4 (BFG)	Front fog light switch on	Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a	Component without harness connected (Headlight Dimmer Switch Assembly)

Toyota Tundra Service Manual > Sfi System: Evaporative Emission Pressure Switching Valve Stuck OFF (P2420)
DTC SUMMARY DTC No. Monitoring Item Malfunction Detection Condition Trouble Area Detection Timing Detection Logic P2420 Vent valve stuck open (vent) Following condition met during key-off EVAP monitor: EVAP pressure change when vent valve closed (ON) less than 0.3 kPa-g (2.25 mmHg-g) Canister pump m ...

Toyota Tundra Owners Manual