Toyota Tacoma 2015-2018 Service Manual: Crankshaft Position Sensor "A" Signal Stuck in Range (P03352A,P033531)

Toyota Tacoma 2015-2018 Service Manual / Rc62f Manual Transmission / Transaxle / Manual Transmission System / Crankshaft Position Sensor "A" Signal Stuck in Range (P03352A,P033531)

DESCRIPTION

The crankshaft position sensor system consists of a crankshaft position sensor plate and a pickup coil. The crankshaft position sensor plate has 34 teeth and is installed to the crankshaft. The pickup coil is made of wound copper wire, an iron core and a magnet. The crankshaft position sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per crankshaft revolution. Based on these signals, the ECM calculates the crankshaft position and engine speed. Using these calculations, the fuel injection and ignition timing are controlled.

DTC Code	DTC Detection Condition	Trouble Area	SAE
P03352A	No crankshaft position sensor signal to ECM while cranking (1 trip detection logic).	SFI system ECM	P0335
P033531	The engine stalls and the engine speed signal value decreases rapidly (1 trip detection logic).	SFI system ECM	P0335

MONITOR DESCRIPTION

A DTC will be stored if any of the following occur:

The crankshaft position sensor signal (NE signal) is not received by the ECM when the engine is being cranked.
The engine stalls and the engine speed signal value decreases rapidly (under normal conditions the engine speed will decrease gradually).

WIRING DIAGRAM

Refer to SFI system DTC P033511 (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

HINT:

If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical section.
After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
1. Start the engine and wait for 3 seconds or more.
2. Check for DTCs again (See page ).

1. DATA LIST

HINT:

The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Start the engine.

(e) Enter the following menus: Powertrain / Engine / Data List / Engine Speed

Engine

Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Speed	Engine speed Min.: 0 rpm Max.: 16383 rpm	500 to 600 rpm: Idling (shift lever in neutral, engine warmed up and A/C off)	When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

Techstream Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed

Min.: 0 rpm

Max.: 16383 rpm

500 to 600 rpm: Idling (shift lever in neutral, engine warmed up and A/C off)

When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

PROCEDURE

1.	CHECK DTC OUTPUT (SFI SYSTEM)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Result

Result	Proceed to
DTCs are not output	A
DTCs are output	B

REPLACE ECM

GO TO SFI SYSTEM

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