On-Vehicle Inspection

HINT:

• If there is any dirt or a blockage in the air cleaner filter element, clean it with compressed air.
• If any dirt or a blockage remains even after cleaning the air cleaner filter element with compressed air, replace it.

1. Warm up and stop the engine.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch ON.
4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1 / ON.

   HINT:

   Refer to the Techstream operator's manual for further details.

5. Inspect the ignition timing during idling.

   Ignition timing: 8 to 12 degrees BTDC 

   NOTE:

   • Turn all the electrical systems and the A/C OFF.
   • Inspect the ignition timing with the cooling fan OFF.
   • When checking the ignition timing, shift the transmission to the neutral position.
6. Select the following menu items: Connect the TC and TE1 / OFF
7. Turn the ignition switch OFF.
8. Disconnect the Techstream from the DLC3.

1. Remove No. 2 cylinder head cover (See REMOVAL ).
2. Pull out the wire harness (brown) shown in the illustration.
   NOTE: After checking, wrap the wire harness with tape.
3. Warm up and stop the engine.
4. Connect the clip of the timing light to the wire harness.
   NOTE: Use a timing light that detects the first signal.
   Fig 1: Connecting Clip Of Timing Light To Wire Harness

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Turn the ignition switch ON.
6. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

   SST 09843-18040 

   NOTE: Examine the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
   Fig 2: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Inspect the ignition timing during idling.

   Ignition timing: 8 to 12 degrees BTDC 

   NOTE:

   • Turn all the electrical systems and the A/C OFF.
   • Inspect the ignition timing with the cooling fan OFF.
   • When checking the ignition timing, shift the transmission to the neutral position.
8. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
9. Turn the ignition switch OFF.
10. Remove the timing light.
11. Install No. 2 cylinder head cover (See INSTALLATION ).

1. Warm up and stop the engine.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch on (IG).
4. Select the following menu items: Powertrain / Engine and ECT / Data List / Av Engine Speed of All Cyl.

   HINT:

   Refer to the Techstream operator's manual for further details.

5. Inspect the engine idling speed.

   Idling speed: 650 to 750 rpm for manual transaxle 

   650 to 750 rpm for automatic transaxle 

   NOTE:

   • Turn all the electrical systems and the A/C OFF.
   • Inspect the idling speed with the cooling fan OFF.
   • When checking the idling speed, shift the transmission to either the neutral position or the parking position.
6. Turn the ignition switch off.
7. Disconnect the Techstream from the DCL3.

1. Warm up and stop the engine.
2. Install SST to terminal 9 (TAC) of the DLC3, then connect a tachometer.

   SST 09843-18040 

   NOTE: Examine the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
   Fig 3: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Turn the ignition switch ON.
4. Inspect the engine idling speed.

   Idling speed: 650 to 750 rpm for manual transaxle 

   650 to 750 rpm for automatic transaxle 

5. Turn the ignition switch OFF.
6. Disconnect the tachometer.
7. Remove SST from terminal 9 (TAC).

Fig 4: Inspecting Cylinder Compression Pressure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Insert a compression gauge into the spark plug hole.
2. Fully open the throttle.
3. While cranking the engine, measure the compression pressure.

   Compression: 1471 kPa (15.0 kgf/cm ²  , 213 psi) 

   Minimum pressure: 1079 kPa (11.0 kgf/cm ²  , 156 psi) 

   Difference between each cylinder: 98 kPa (1.0 kgf/cm ²  , 14 psi) or less 

   NOTE:

   • Use a fully-charged battery so the engine speed can be increased to 250 rpm or more.
   • Inspect the other cylinders in the same way.
   • Measure the compression in as short a time as possible.
4. If the cylinder compression is low, pour a light coat of engine oil into the cylinder through the spark plug hole, then inspect it again.

   HINT:

   • If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
   • If the pressure stays low, the valve may be stuck or seated improperly, or there may be leakage from the gasket.

Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) 

HINT:

When doing the 2 mode (with the engine idling/running at 2500 rpm) test, the measuring procedures are determined by applicable local regulations.

If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given below.

1. Check the heated oxygen sensor operation (see INSPECTION ).
2. See the table below for possible causes, then inspect the applicable parts and repair them if necessary.
   POSSIBLE CAUSES CHART
   
   

   CO	HC	Problems	Possible Causes
   Normal	High	Rough idling	Faulty ignition: Incorrect timing Fouled, shorted or improperly gapped plugs Incorrect valve clearance Leakage from intake and exhaust valves Leakage from cylinders
   Low	High	Rough idling (Fluctuating HC reading)	Vacuum leaks: PCV hoses Intake manifold Throttle body Brake booster line Lean mixture causing misfire
   High	High	Rough idling (Black smoke from exhaust)	Restricted air cleaner filter element Plugged PCV valve Faulty EFI systems: Faulty pressure regulator Faulty engine coolant temperature sensor Faulty mass air flow meter Faulty ECM Faulty injectors Throttle body