Kit A
"Modification of 1983 model year U.S. cars with low-altitude/high-altitude specifications."General The 1983 U.S. vehicles intended primarily for use in high-altitude areas must be equipped with new high-altitude kit contained the altitude switch or the altitude compensator. The high-altitude kit installation procedure is as described below. In addition, the procedure for remodification of vehicle from high-altitude specifications to low-altitude specifications is also described.
NOTE: High-altitude kits vary with the type of vehicle. Prior to installation, be sure to read the instruction manual supplied with the kit thoroughly.
Figure 1:
(REMARKS)
1983 MY vehicle equipped with former highaltitude kit can be modified using this kit. The procedure for this modification is also described. Applicable text is enclosed in frame. On the other hand, the operations that have been already performed with the former kit are indicated by putting an asterisk (*) at the top of the steps, and these steps may be skipped.
HIGH-ALTITUDE KIT A (483337210) Used on Hitachi carburetor equipped vehicles (except 4WD vehicles) for 49 states.
1. Component Parts
When modifying 1983 MY vehicle equipped with former high-altitude kit (483337200) using the new kit, only the following parts out of the parts listed in Fig. 1 are required.
(1) Altitude switch
(8) Tapping screw (2 pcs.)
(10) Installation manual Only the following steps out of steps given In the modification procedure are required to be performed.
(1) and (4) of "2. Installation Procedures" All "3. Function checking"
2. Installation Procedures
NOTE: Numbers enclosed with a circle in the following explanation mean the parts shown in Fig. 1.
Figure 2:
Figure 3:
(1) Installation and wiring of altitude switch
1) Install altitude switch (1) to the flat square section (hatched area in Fig. 2) of the bulkhead behind R. H. strut mount by means of two tapping screws (8). Drill mounting holes (2 places) in advance as shown in Fig. 3.
NOTE: a. When drilling holes, take care not to allow chips to scatter and after drilling, wipe away chips.
b. Tighten tapping screws firmly, but do not overtighten as the plate is thin.
2) Connect the altitude switch connector with the black connnector (single pin "B" of Fig. 2) coming from the ECM wiring harness.
NOTE: Insert connector sufficiently until locked.
In the case of vehicle with former altitude kit (483337200) already mounted, remove the grounding wire from between connector "B" and bolt "A" as shown in Fig. 2 and then perform step 2) above.
Figure 4:
*(2) Hose installation
1) Remove the rubber cap from the nipple located on the rear side of the carburetor ("C" in Fig. 4).
2) Remove the hose extending from the control air filter to the duty solenoid (slow) and remove the hose clamps.
3) Install the hose (4 X 9 X 25 x 185) (3) to the hose assembly (2) and install them in place of the hose removed in Step 2). At the time, fit the hose clamps removed in Step 2).
4) Connect the hose (4 X 9 x 25 x 185) (3) to the nipple "C" on the rear side of the carburetor and secure to the duty hose intermediately with the clamp (6) as showp in Fig. 4.
Servo
5) On manual transmission vehicles, remove the hose extending from the surge tank to the duty Solenoid valve (main) and remove the hose clamp. (The hose removed contains an orifice.)
6) Install the hose (5.5 x 12 x 35 x 35) (7) in place of the removed hose in Step 5). At this time, install the hose clamp. (Fig. 4.)
*(3) Replacement and addition of EGR Leak Orifice
Figure 5:
^Manual transmission vehicles; Remove the hatched positioning hose as shown in Fig. 5, put the orifice with a groove around it, contained in the orifice set 5, into the hose (4 x 9 X 25 X 25) (4) and install the hose to the same position as the removed hose.
^ Automatic transmission vehicles; Remove the two rubber caps as shown in Fig. 5, put the grooveless orifice, contained the orifice set (5), into the hose (4 X 9 X 25 X 25) (4), and install the hose to the same positions as the removed rubber cabs.
Figure 6:
(4)Checking and adjusting engine idling speed Check to see that the engine idling speed is within the range shown in the following table, and adjust to specification if necessary. Engine idle speed (rpm)
Manual transmission vehicles 700 +/- 100
Automatic transmission vehicle 800 +/- 100 (at neutral (or N) or P position)
*(5) Affixing high altitude label On vehicles equipped with this high-altitude kit, affix the high-altitude label to the reverse side of the engine hood, at the position shown in Fig, 6.
Figure 7:
3. Function Checking After completion of the above procedure check for high-altitude function according to the following procedures.
(1) Altitude switch check
1) Disconnect the altitude switch connector from the ECM wiring harness connector.
2) As shown in Fig. 7, check continuity between the altitude switch connector pin and the tapping screw securing to the vehicle body, using a tester (ohms range).
Further, check continuity between the altitude switch connector pin and the battery negative terminal.
The high and low altitude modes are identified as follows:
With continuity (ON) Without continuity (OFF)
High altitude (H/A) mode Sea level(S/L) mode
(2) High altitude strategy check Check whether it is in the high altitude mode according to the following flowchart.
Figure 4:
4. High-altitude to low-altitude modification procedure To remodify the vehicle, modified to highaltitude specification by use of kit A, into low-altitude vehicle, proceed as follows:
NOTE: Keep the altitude switch as mounted to the body, and do not disconnect the connector.
1) Remove the hose from position "C" on the rear side of the carburetor and cap the opening. (See Fig. 4.)
2) Remove the hose (hose assembly (2) shown in Fig. 4.) connected between the control air filter and the duty solenoid valve (slow). Connect a single hose instead.
3) On manual transmission vehicles, replace the hose connectors between the surge tank and the duty solenoid valve (main) with a new one, (See Fig. 4.)
Figure 5:
Replace the EGR leak orifice to low-altitude specifications shown below. (See Fig. 5.)
Vehicle type Orifice diameter
Manual transmission 0.7 mm
vehicles
Automatic transmission (Rubber cap)
vehicles
Figure 6:
5) Check to see that the engine idling speed is within the specified range and adjust if necessary. Engine idle speed (rpm)
Manual transmission 700 +/- 100
vehicles
Automatic transmission
vehicles 800 +/- 100
[at neutral (or N) or P position]
6) Remove the high-altitude label from the reverse side of the engine hood. (See Fig. 6.)
7) Check for low-altitude function in the same manner as described in "3. Function checking".