Just picked up a 1999 2rz (rollover tacoma) to swap into my locost (lotus 7 hot rod). The 240k mi 22RE just didnt seem like a great place to start modding, so the 2rz will go in. Found it on craigslist for $950, paid $750. Engine, engine harness (few wires are cut), ecu, cluster, 5-speed (w59 i believe), bellhousing, ac compressor, alternator, starter, airbox.
Since the 2rz seems to have a much 'smarter' computer than the 22re, does anyones know which sensors are required to let the computer run the engine, without going into a 'limp' mode or shutting down? The following is from the 2003 tacoma FSM:
A. ECU input list:
(1) Engine coolant temp. signal system
The engine coolant temp. sensor detects the engine coolant temp. and has a built–in thermistor with a resistance which
varies according to the water temp. Thus the engine coolant temp. is input in the form of a control signal to TERMINAL
THW of the engine control module.
(2) Intake air temp. signal system
The intake air temp. sensor is installed inside the mass air flow meter and detects the intake air temp., which is input as
a control signal to TERMINAL THA of the engine control module.
(3) Heated oxygen sensor signal system
The oxygen density in the exhaust emissions is detected and input as a control signal to TERMINAL OXS of the engine
control module. To maintain stable detection performance by the heated oxygen sensor, a heater is used for warming
the sensor. The heater is also controlled by the engine control module (HTS).
(4) RPM signal system
Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor,
camshaft position is input as a control signal to TERMINAL G2+ of the engine control module, and engine RPM is input
to TERMINAL NE–.
(5) Throttle signal system
The throttle position sensor detects the throttle valve opening angle, which is input as a control signal to TERMINAL VTA
of the engine control module.
(6) Vehicle speed signal system
The vehicle speed sensor detects the vehicle speed and inputs a control signal to TERMINAL SP1 of the engine control
module via the combination meter.
(7) A/C SW signal system
The operating voltage of the A/C magnetic clutch is detected and input in the form of a control signal to TERMINAL AC1
of the engine control module.
(8) Battery signal system
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned to on,
voltage for engine control module operation is applied via the EFI relay to TERMINAL +B of the engine control module.
(9) Intake air volume signal system
Intake air volume is detected by the mass air flow meter and a signal is input into TERMINAL VG of the engine control
module as a control signal.
(10)Stop light SW signal system
The stop light SW is used to detect whether or not the vehicle is braking and the information is input as a control signal
to TERMINAL STP of the engine control module.
(11) Starter signal system
To confirm that the engine is cranking, the voltage applied to the starter motor during cranking is detected and is input as
a control signal to TERMINAL STA of the engine control module.
(12)Engine knock signal system
Engine knocking is detected by the knock sensor and input as a control signal to TERMINAL KNK of the engine control
module.
(13)Air fuel ratio signal system
The air fuel ratio is detected and input as a control signal into TERMINAL AF+ of the engine control module.
B. CONTROL SYSTEM
∗ SFI system
The SFI system monitors the engine conditions through the signals (Input signals (1 to 12) ) input from each sensor to
the engine control module. Based on this data and the program memorized in the engine control module, the mos
appropriate fuel injection timing is decided and current is output to TERMINALS #10, #20, #30 and #40 of the engine
control module, causing the injectors to operate (to inject fuel). It is this system which, through the work of the engine
control module, finely controls fuel injection in response to driving conditions.
∗ Electronic spark advance system
The ESA system monitors the engine conditions using the signals (input signals (1, 4, 5 to 7, 9, 11, 12) ) input to the
engine control module from each sensor. Based on this data and the program memorized in the engine control module
the most appropriate ignition timing is decided and current is output to TERMINALS IGT1, IGT2, IGT3 and IGT4 of the
engine control module. This output controls the igniter to produce the most appropriate ignition timing for the driving
conditions.
∗ Heated oxygen sensor heater control system
The heated oxygen sensor heater control system turns the heater to on when the intake air volume is low (Temp. o
exhaust emissions low), and warms up the heated oxygen sensor to improve detection performance of the sensor. The
engine control module evaluates the signals (Input signals (1, 4, 8, 9, 11) ) from each sensor, current is output to
TERMINAL HT1B and controls the heater.
3. DIAGNOSIS SYSTEM
With the diagnosis system, when there is a malfunction in the ECU signal system, the malfunctioning system is recorded in
the memory. The malfunctioning system can then be found by reading the display (Code) of the malfunction indicator lamp.
4. FAIL–SAFE SYSTEM
When a malfunction occurs in any system, if there is a possibility of engine trouble being caused by continued control based
on the signals from that system, the fail–safe system either controls the system by using data (Standard values) recorded in
the engine control module memory or else stops the engine.
inputs 3,6,7, and 10 are what i am really curious about. Is the air-fuel sensor just a pre-cat narrowband o2? Can the heated oxygen sensor (which is located post-cat) be removed, or is a dummy signal needed? Also, can all wiring for the VSV (vac switching valves) for EVAP, and the vapor pressure sensor (in the gas tank?) be removed? How about the EGR system- will block off plates suffice if i leave the temp sensor in?
I figure removing any of the sensors will throw a CEL, but which signals can be faked, and which signals really do affect the engine performance...
