INSPECTION PROCEDURE 1. INSPECT UNLOCK WARNING SWITCH ASSEMBLY 
(a) Measure the resistance according to the value(s) in the table below. Standard resistance:
If the result is not as specified, replace the unlock warning switch assembly. Text in Illustration
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Toyota Tundra Service Manual > Sfi System: Ignition Coil "A" Primary / Secondary Circuit (P0351-P0358)
DESCRIPTION HINT: These DTCs indicate malfunctions relating to the primary circuit. If DTC P0351 is stored, check the No. 1 ignition coil circuit. If DTC P0352 is stored, check the No. 2 ignition coil circuit. If DTC P0353 is stored, check the No. 3 ignition coil circuit. If DTC P0354 is stored, che ...
