ENGINE CONTROL MODULE (ECM)
| Model | Location |
|---|---|
| Celica | Below Passenger's Side Of Dash, Underneath Carpet |
ECM LOCATION
ENGINE SENSORS
Note. For locations of engine sensors not covered in this article, see appropriate THEORY/OPERATION article.
| Model | Location |
|---|---|
| Celica | Side Of Cylinder Block, Near Alternator |
| (1) Knock sensor monitors ignition knock conditions and delivers an input signal to KNK or KNK1 and KNK2 terminals of Engine Control Module (ECM). The ECM uses input signal to determine ignition timing (spark advance) and control fuel injection system. | |
| (1) | Knock sensor monitors ignition knock conditions and delivers an input signal to KNK or KNK1 and KNK2 terminals of Engine Control Module (ECM). The ECM uses input signal to determine ignition timing (spark advance) and control fuel injection system. |
KNOCK SENSOR LOCATIONS (1)
DISTRIBUTOR
Note. For timing specifications and procedures, see information in ADJUSTMENTS article.
FUEL SYSTEM PRESSURE RELEASE
| WARNING | High fuel pressure may be present in fuel lines and component parts. Before opening system for testing purposes or component replacement, relieve fuel pressure. DO NOT allow fuel to flow onto engine or electrical parts. Whenever possible, release fuel pressure at fuel filter fitting. |
Disconnect negative battery cable. If possible, position container under fuel fitting to be loosened. To prevent fuel spraying, use a rag to cover fuel fitting to be loosened. Slowly loosen fitting, allowing pressurized fuel to spill into container or spray into rag(s). After fuel system pressure is released, disconnect fitting and plug all openings.
CHECKING FOR FUEL LEAKS
Note. After replacing fuel system components or performing fuel system maintenance, verify there are no fuel leaks.
Using Diagnosis Check Wire (SST09843-18020), connect Data Link Connector 1 (DLC1) terminals +B and FP. Turn ignition on, with engine off. When fuel return hose is pinched (DO NOT bend hose, as it may cause cracking), fuel pressure within high pressure line will rise to approximately 57 psi (4 kg/cm 2 ). Pinch fuel return hose and verify there are no fuel system leaks. When inspection is completed, turn ignition off and remove diagnosis check wire from DLC1.
FUEL INJECTORS & FUEL RAILS
Note. Install NEW grommets and "O" rings when replacing fuel injectors or reinstalling old injectors. Verify injectors rotate smoothly in injector ports and in fuel rail. If injectors do not rotate smoothly, check "O" rings for proper installation.
OXYGEN (O2) & SUB-OXYGEN SENSORS
Note. To ease removal of O2 sensor and/or its mounting bolts from exhaust pipe/manifold, it may be necessary to apply penetrating oil to threads. Also run engine a few minutes to heat exhaust system to about 120°F (48°C).
FUEL PRESSURE REGULATORS
Note. If component removal and installation is primarily an unbolt and bolt-on procedure, only a torque specification may be furnished. See TORQUE SPECIFICATIONS TABLE at the end of this article.